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Data Mining Techniques: Types of Data, Methods, Applications

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21st Sep, 2022
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Data Mining Techniques: Types of Data, Methods, Applications

Businesses these days are collecting data at a very striking rate. The sources of this enormous data stream are varied. It could come from credit card transactions, publicly available customer data, data from banks and financial institutions, as well as the data that users have to provide just to use and download an application on their laptops, mobile phones, tablets, and desktops.

It is not easy to store such massive amounts of data. So, many relational database servers are being continuously built for this purpose. Online transactional protocol or OLTP systems are also being developed to store all that into different database servers. OLTP systems play a vital role in helping businesses function smoothly.

It is these systems that are responsible for storing data that comes out of the smallest of transactions into the database. So, data related to sale, purchase, human capital management, and other transactions are stored in database servers by OLTP systems. 

Now, top executives need access to facts based on data to base their decisions on. This is where online analytical processing or OLAP systems enter the picture. Data warehouses and other OLAP systems are built more and more because of this very need of or top executives. We don’t only need data but also the analytics associated with it to make better and more profitable decisions. OLTP and OLAP systems work in tandem.

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OLTP systems store all massive amounts of data that we generate on a daily basis. This data is then sent to OLAP systems for building data-based analytics. If you don’t already know, then let us tell you that data plays a very important role in the growth of a company. It can help in making knowledge-backed decisions that can take a company to the next level of growth. Data examination should never happen superficially.

It doesn’t serve the purpose. We need to analyze data to enrich ourselves with the knowledge that will help us in making the right calls for the success of our business. All the data that we have been flooded with these days isn’t of any use if we aren’t learning anything from it. Data available to us is so huge that it is humanly impossible for us to process it and make sense of it. Data mining or knowledge discovery is what we need to solve this problem. Learn about other applications of data mining in real world.

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What is Data Mining?

Data mining is the process that helps in extracting information from a given data set to identify trends, patterns, and useful data. The objective of using data mining is to make data-supported decisions from enormous data sets. 

Data mining works in conjunction with predictive analysis, a branch of statistical science that uses complex algorithms designed to work with a special group of problems. The predictive analysis first identifies patterns in huge amounts of data, which data mining generalizes for predictions and forecasts. Data mining serves a unique purpose, which is to recognize patterns in datasets for a set of problems that belong to a specific domain.

It does this by using a sophisticated algorithm to train a model for a specific problem. When you know the domain of the problem you are dealing with, you can even use machine learning to model a system that is capable of identifying patterns in a data set. When you put machine learning to work, you will be automating the problem-solving system as a whole, and you wouldn’t need to come up with special programming to solve every problem that you come across. 

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We can also define data mining as a technique of investigation patterns of data that belong to particular perspectives. This helps us in categorizing that data into useful information. This useful information is then accumulated and assembled to either be stored in database servers, like data warehouses, or used in data mining algorithms and analysis to help in decision making. Moreover, it can be used for revenue generation and cost-cutting amongst other purposes.

Data mining is the process of searching large sets of data to look out for patterns and trends that can’t be found using simple analysis techniques. It makes use of complex mathematical algorithms to study data and then evaluate the possibility of events happening in the future based on the findings. It is also referred to as knowledge discovery of data or KDD.

Data mining is used by businesses to draw out specific information from large volumes of data to find solutions to their business problems. It has the capability of transforming raw data into information that can help businesses grow by taking better decisions. Data mining has several types, including pictorial data mining, text mining, social media mining, web mining, and audio and video mining amongst others. 

Read: Data Mining vs Machine Learning

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Data Mining Process

After understanding the data mining definition, let’s understand the data mining process. Before the actual data mining could occur, there are several processes involved in data mining implementation. Here’s how:

Step 1: Business Research – Before you begin, you need to have a complete understanding of your enterprise’s objectives, available resources, and current scenarios in alignment with its requirements. This would help create a detailed data mining plan that effectively reaches organizations’ goals. 

Step 2: Data Quality Checks – As the data gets collected from various sources, it needs to be checked and matched to ensure no bottlenecks in the data integration process. The quality assurance helps spot any underlying anomalies in the data, such as missing data interpolation, keeping the data in top-shape before it undergoes mining. 

Step 3: Data Cleaning – It is believed that 90% of the time gets taken in the selecting, cleaning, formatting, and anonymizing data before mining. 

Step 4: Data Transformation – Comprising five sub-stages, here, the processes involved make data ready into final data sets. It involves:

  • Data Smoothing: Here, noise is removed from the data. Noisy data is information that has been corrupted in transit, storage, or manipulation to the point that it is unusable in data analysis. Aside from potentially skewing the outcomes of any data mining research, storing noisy data also raises the amount of space that must be allocated for the dataset.
  • Data Summary: The aggregation of data sets is applied in this process.
  • Data Generalization: Here, the data gets generalized by replacing any low-level data with higher-level conceptualizations.
  • Data Normalization: Here, data is defined in set ranges. For data mining to work, normalization of the data is a must. It basically means changing the data from its original format into one more suitable for processing. The goal of data normalization is to reduce or eliminate redundant information.
  • Data Attribute Construction: The data sets are required to be in the set of attributes before data mining

Step 5: Data Modelling: For better identification of data patterns, several mathematical models are implemented in the dataset, based on several conditions. Learn data science to understand and utilize the power of data mining. 

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Types of data that can be mined

1. Data stored in the database

A database is also called a database management system or DBMS. Every DBMS stores data that are related to each other in a way or the other. It also has a set of software programs that are used to manage data and provide easy access to it. These software programs serve a lot of purposes, including defining structure for database, making sure that the stored information remains secured and consistent, and managing different types of data access, such as shared, distributed, and concurrent.

A relational database has tables that have different names, attributes, and can store rows or records of large data sets. Every record stored in a table has a unique key. Entity-relationship model is created to provide a representation of a relational database that features entities and the relationships that exist between them. 

2. Data warehouse

A data warehouse is a single data storage location that collects data from multiple sources and then stores it in the form of a unified plan. When data is stored in a data warehouse, it undergoes cleaning, integration, loading, and refreshing. Data stored in a data warehouse is organized in several parts. If you want information on data that was stored 6 or 12 months back, you will get it in the form of a summary. 

3. Transactional data

Transactional database stores record that are captured as transactions. These transactions include flight booking, customer purchase, click on a website, and others. Every transaction record has a unique ID. It also lists all those items that made it a transaction. 

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4. Other types of data

We have a lot of other types of data as well that are known for their structure, semantic meanings, and versatility. They are used in a lot of applications. Here are a few of those data types: data streams, engineering design data, sequence data, graph data, spatial data, multimedia data, and more.

Data Mining Techniques

1. Association

It is one of the most used data mining techniques out of all the others. In this technique, a transaction and the relationship between its items are used to identify a pattern. This is the reason this technique is also referred to as a relation technique. It is used to conduct market basket analysis, which is done to find out all those products that customers buy together on a regular basis.

This technique is very helpful for retailers who can use it to study the buying habits of different customers. Retailers can study sales data of the past and then lookout for products that customers buy together. Then they can put those products in close proximity of each other in their retail stores to help customers save their time and to increase their sales. 

The association rule provides two key details:

  • How often is the support rule applied?
  • How often is the Confidence rule correct?

 

This data mining technique adopts a two-step process.

  • Finds out all the repeatedly occurring data sets.
  • Develop strong association rules from the recurrent data sets.

Three types of association rules are:

  • Multilevel Association Rule
  • Quantitative Association Rule
  • Multidimensional Association Rule

2. Clustering

Another data mining methodology is clustering. This creates meaningful object clusters that share the same characteristics. People often confuse it with classification, but if they properly understand how both these data mining methodologies or techniques work, they won’t have any issue. Unlike classification that puts objects into predefined classes, clustering puts objects in classes that are defined by it.

Let us take an example. A library is full of books on different topics. Now the challenge is to organize those books in a way that readers don’t have any problem in finding out books on a particular topic. We can use clustering to keep books with similarities in one shelf and then give those shelves a meaningful name. Readers looking for books on a particular topic can go straight to that shelf. They won’t be required to roam the entire library to find their book. 

Clustering analysis identifies data that are identical to each other. It clarifies the similarities and differences between the data. It is known as segmentation and provides an understanding of the events taking place in the database.

 

Different types of clustering methods are:

  • Density-Based Methods
  • Model-Based Methods
  • Partitioning Methods
  • Hierarchical Agglomerative methods
  • Grid-Based Methods

The most famous clustering algorithm is the Nearest Neighbor which is quite identical to clustering. Essentially, it is a prediction technique to predict an estimated value that records look for records with identical estimated values within a historical database. Consequently, it uses the prediction value from the form adjacent to the unclassified document. So, this data mining technique explains that the objects which are nearer to one another will share identical prediction values.

3. Classification

This technique finds its origins in machine learning. It classifies items or variables in a data set into predefined groups or classes. It uses linear programming, statistics, decision trees, and artificial neural network in data mining, amongst other techniques. Classification is used to develop software that can be modelled in a way that it becomes capable of classifying items in a data set into different classes.

For instance, we can use it to classify all the candidates who attended an interview into two groups – the first group is the list of those candidates who were selected and the second is the list that features candidates that were rejected. Data mining software can be used to perform this classification job. 

4. Prediction

Prediction is one of the other data mining methodologies. This technique predicts the relationship that exists between independent and dependent variables as well as independent variables alone. It can be used to predict future profit depending on the sale. Let us assume that profit and sale are dependent and independent variables, respectively. Now, based on what the past sales data says, we can make a profit prediction of the future using a regression curve. 

5. Sequential patterns

This technique aims to use transaction data, and then identify similar trends, patterns, and events in it over a period of time. The historical sales data can be used to discover items that buyers bought together at different times of the year. Business can make sense of this information by recommending customers to buy those products at times when the historical data doesn’t suggest they would. Businesses can use lucrative deals and discounts to push through this recommendation.

6. Statistical Techniques

Statistics is one of the branches of mathematics that links to the data’s collection and description. Many analysts don’t consider it a data mining technique. However, it helps to identify the patterns and develop predictive models. Therefore, data analysts must have some knowledge about various statistical techniques. Currently, people have to handle several pieces of data and derive significant patterns from them. The statistical data mining techniques help them get answers to the following questions:

  • What are the ways available in their database?
  • What is the likelihood of an event occurring?
  • Which patterns are more beneficial to the business?
  • What is the high-level summary capable of providing you with an in-depth view of components existing in the database?

Statistical techniques not only answer these questions but also help to summarize the data and calculate it. You can make smart decisions from the precise data mining definition conveyed through statistical reports. From diverse forms of statistics, the most useful technique is gathering and calculating data. Various ways to collect data are:

  • Mean
  • Median
  • Mode
  • Max
  • Min
  • Variance
  • Histogram
  • Linear Regression

 7. Induction Decision Tree Technique

Implied from the name, it appears like a tree and is a predictive model. In this data mining technique, every tree branch is observed as a classification question. The trees’ leaves are the partitions of the dataset associated with that specific classification. Moreover, this technique is used for data pre-processing, exploration analysis, and prediction analysis. So, it is one of the versatile data mining methods.

The decision tree used in this technique is the original dataset’s segmentation. Every data falling under a segment shares certain similarities with the information already predicted. The decision trees offer easily understandable results.

Two examples of the Induction Decision Tree Technique are CART (Classification and Regression Trees) and CHAID (Chi-Square Automatic Interaction Detector).

8. Visualization

Visualization is used to determine data patterns. This data mining technique is used in the initial phase of the data mining process. It is one of those effective data mining methods that help to discover hidden patterns.

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Data Mining Applications

Data mining methods are applied in a variety of sectors from healthcare to finance and banking. We have taken the epitome of the lot to bring into light the characteristics of data mining and its five applications. 

Below are some most useful data mining applications lets know more about them.

1. Healthcare

Data mining methods has the potential to transform the healthcare system completely. It can be used to identify best practices based on data and analytics, which can help healthcare facilities to reduce costs and improve patient outcomes. Data mining, along with machine learning, statistics, data visualization, and other techniques can be used to make a difference. It can come in handy when forecasting patients of different categories. This will help patients to receive intensive care when and where they want it. Data mining can also help healthcare insurers to identify fraudulent activities.

2. Education

Use of data mining methods in education is still in its nascent phase. It aims to develop techniques that can use data coming out of education environments for knowledge exploration. The purposes that these techniques are expected to serve include studying how educational support impacts students, supporting the future-leaning needs of students, and promoting the science of learning amongst others. Educational institutions can use these techniques to not only predict how students are going to do in examinations but also make accurate decisions. With this knowledge, these institutions can focus more on their teaching pedagogy. 

3. Market basket analysis

This is a modelling technique that uses hypothesis as a basis. The hypothesis says that if you purchase certain products, then it is highly likely that you will also purchase products that don’t belong to that group that you usually purchase from. Retailers can use this technique to understand the buying habits of their customers. Retailers can use this information to make changes in the layout of their store and to make shopping a lot easier and less time consuming for customers. 

Apart from the ones where characteristics of data mining and its five applications in major fields are mentioned above. Other fields and methodologies also benefit from data mining methods, we have listed them below as well:

4. Customer relationship management (CRM)

CRM involves acquiring and keeping customers, improving loyalty, and employing customer-centric strategies. Every business needs customer data to analyze it and use the findings in a way that they can build a long-lasting relationship with their customers. Data mining can help them do that. 

Applications of data mining in CRM include:

  • Sales Forecasting: Businesses may better plan restocking needs by analyzing trends over time with the use of data mining techniques. It also aids in financial management, and supply chain management, and offers you full command over your own internal processes.
  • Market Segmentation: Keep their preferences in mind when creating ads and other marketing materials. With the use of data mining techniques, it is possible to recognize which segment of the market provides the best return on investment. With that information, one won’t waste time or resources pursuing leads who aren’t interested in purchasing a particular product. 
  • Identifying the loyalty of customers: In order to improve brand service, customer satisfaction, and customer loyalty, data mining employs a concept known as “customer cluster,” which draws upon information shared by social media audiences.

5. Manufacturing engineering

A manufacturing company relies a lot on the data or information available to it. Data mining can help these companies in identifying patterns in processes that are too complex for a human mind to understand. They can identify the relationships that exist between different system-level designing elements, including customer data needs, architecture, and portfolio of products.

Data mining can also prove useful in forecasting the overall time required for product development, the cost involved in the process, and the expectations companies can have from the final product. 

The data can be evaluated by guaranteeing that the manufacturing firm owns enough knowledge of certain parameters. These parameters are recognizing the product architecture, the correct set of product portfolios, and the customer requirements. The efficient data mining capabilities in manufacturing and engineering guarantee that the product development completes in the stipulated time frame and does not surpass the budget allocated initially.

6. Finance and banking

The banking system has been witnessing the generation of massive amounts of data from the time it underwent digitalization. Bankers can use data mining techniques to solve the baking and financial problems that businesses face by finding out correlations and trends in market costs and business information. This job is too difficult without data mining as the volume of data that they are dealing with is too large. Managers in the banking and financial sectors can use this information to acquire, retain, and maintain a customer. 

The analysis turns easy and quick by sampling and recognizing a large set of customer data. Tracking mistrustful activities become straightforward by analyzing the parameters like transaction period, mode of payments, geographical locations, customer activity history, and more. The customer’s relative measure is calculated based on these parameters. Consequently, it can be used in any form depending on the calculated indices. So, finance and banking are one of valuable data mining techniques.

Learn more: Association Rule Mining

7. Fraud detection

Fraudulent activities cost businesses billions of dollars every year. Methods that are usually used for detecting frauds are too complex and time-consuming. Data mining provides a simple alternative. Every ideal fraud detection system needs to protect user data in all circumstances. A method is supervised to collect data, and then this data is categorized into fraudulent or non-fraudulent data. This data is used in training a model that identifies every document as fraudulent or non-fraudulent.

8. Monitoring Patterns

Known as one of the fundamental data mining techniques, it generally comprises tracking data patterns to derive business conclusions. For an organization, it could mean anything from identifying sales upsurge or tapping newer demographics.

9. Classification

To derive relevant metadata, the classification technique in data mining helps in differentiating data into separate classes:

  • Based on the type of data sources, mined

Depending on the type of data handled like text-based data, multimedia data, spatial data, time-series data, etc.

  • Based on the data framework involved

Any data set that is based on the object-oriented database, relational database, etc.

  • Based on data mining functionalities

Here the data sets are differentiated based on the approach taken like Machine Learning, Algorithms, Statistics, Database or data warehouse, etc.

  • Based on user interaction in data mining

The datasets are used to differentiate based on query-driven systems, autonomous systems. 

10. Association

Otherwise known as relation technique, the data is identified based on the relationship between the values in the same transaction. It is especially handy for organizations trying to spot trends into purchases or product preferences. Since it is related to customers’ shopping behavior, an organization can break down data patterns based on the buyers’ purchase histories.

11. Anomaly Detection

If a data item is identified that does not match up to a precedent behavior, it is an outlier or an exception. This method digs deep into the process of the creation of such exceptions and backs it with critical information. 

Generally, anomalies can be aloof in its origin, but it also comes with the possibility of finding out a focus area. Therefore, businesses often use this method to trace system intrusion, error detection, and keeping a check on the system’s overall health. Experts prefer the emission of anomalies from the data sets to increase the chances of correctness.

12. Clustering

Just as it sounds, this technique involves collating identical data objects into the same clusters. Based on the dissimilarities, the groups often consist of using metrics to facilitate maximum data association. Such processes can be helpful to profile customers based on their income, shopping frequency, etc. 

Check out: Difference between Data Science and Data Mining

13. Regression

A data mining process that helps in predicting customer behavior and yield, it is used by enterprises to understand the correlation and independence of variables in an environment. For product development, such analysis can help understand the influence of factors like market demands, competition, etc. 

14. Prediction

As implied in its name, this compelling data mining technique helps enterprises to match patterns based on current and historical data records for predictive analysis of the future. While some of the approaches involve Artificial Intelligence and Machine Learning aspects, some can be conducted via simple algorithms.  

Organizations can often predict profits, derive regression values, and more with such data mining techniques.

15. Sequential Patterns

It is used to identify striking patterns, trends in the transaction data available in the given time. For discovering items that customers prefer to buy at different times of the year, businesses offer deals on such products. 

Read: Data Mining Project Ideas

16. Decision Trees

One of the most commonly used data mining techniques; here, a simple condition  is the crux of the method. Since such terms have multiple answers, each of the solutions further branches out into more states until the conclusion is reached. Learn more about decision trees.

17. Visualization

No data is useful without visualizing the right way since it’s always changing. The different colors and objects can reveal valuable trends, patterns, and insights into the vast datasets. Therefore, businesses often turn to data visualization dashboards that automate the process of generating numerical models.

18. Neural Networks

It represents the connection of a particular machine learning model to an AI-based learning technique. Since it is inspired by the neural multi-layer system found in human anatomy, it represents the working of machine learning models in precision. It can be increasingly complex and therefore needs to be dealt with extreme care.

19. Data Warehousing

While it means data storage, it symbolizes the storing of data in the form of cloud warehouses. Companies often use such a precise data mining method to have more in-depth real-time data analysis. Read more about data warehousing.

20. Transportation

The batch or historic form data helps recognize the mode of transport a specific customer usually chooses to a specific place. It accordingly offers them attractive offers and discounts on newly launched products and services. Therefore, it will be included in the organic and targeted advertisements wherein the customer’s potential leader produces the right to transform the lead. Moreover, it helps in deciding the distribution of the schedules across different outlets and warehouses for analyzing load-focused patterns. The transportation sector uses advanced mining methods in data mining.

Data Mining Tools

All that AI and Machine learning inference must have got you into wondering that for data mining implementation, you’d require nothing less. That might not entirely be true, as, with the help of most straightforward databases, you can get the job done with equal accuracy. 

Let us talk about a few data mining methodology and tools that are currently being used in the industry:

  • RapidMiner: RapidMiner is an open-source platform for data science that is available for no cost and includes several algorithms for tasks such as data preprocessing ML/DL, text mining, and predictive analytics. For use cases like fraud detection and customer attrition, RapidMiner’s easy GUI(graphical user interface)and pre-built models make it easy for non-programmers to construct predictive processes. Meanwhile, RapidMiner’s R and Python add-ons allow developers to fine-tune data mining to their specific needs.
  • Oracle Data Mining: Predictive models may be developed and implemented with the help of Oracle Data Mining, which is a part of Oracle Advanced Analytics. Models built using Oracle Data Mining may be used to do things like anticipating customer behaviour, dividing up customer profiles into subsets, spot fraud, and zeroing in on the best leads. These models are available as a Java API for integration into business intelligence tools, where they might aid in the identification of previously unnoticed patterns and trends.
  • Apache Mahout: It is a free and open-source machine-learning framework. Its purpose is to facilitate the use of custom algorithms by data scientists and researchers. This framework is built on top of Apache Hadoop and is written in JavaScript. Its primary functions are in the fields of clustering and classification. Large-scale, sophisticated data mining projects that deal with plenty of information work well with the Apache Mahout.
  • KNIME: KNIME (Konstanz Information Miner) is an (open-source) data analysis platform that allows you to quickly develop, deploy, and scale. This tool makes predictive intelligence accessible to beginners. It simplifies the process through its GUI tool, which includes a step-by-step guide. The product is endorsed as an ‘End to End Data Science’ product.
  • ORANGE: You must know what is data mining before you use tools like ORANGE. It is a machine learning and data science tool. It uses visual programming and Python scripting that features engaging data analysis and component-focused assembly of data mining mechanisms. Moreover, ORANGE is one of the versatile mining methods in data mining because it provides a wider range of features than many other Python-focused machine learning and data mining tools. Moreover, it presents a visual programming platform with a GUI tool for engaging data visualization.

Also, read about the most useful data mining applications.

Conclusion

Data mining brings together different methods from a variety of disciplines, including data visualization, machine learning, database management, statistics, and others. These techniques can be made to work together to tackle complex problems. Generally, data mining software or systems make use of one or more of these methods to deal with different data requirements, types of data, application areas, and mining tasks. 

If you are curious to learn about data science, check out IIIT-B & upGrad’s Executive PG Programme in Data Science which is created for working professionals and offers 10+ case studies & projects, practical hands-on workshops, mentorship with industry experts, 1-on-1 with industry mentors, 400+ hours of learning and job assistance with top firms.

Profile

Rohit Sharma

Blog Author
Rohit Sharma is the Program Director for the UpGrad-IIIT Bangalore, PG Diploma Data Analytics Program.

Frequently Asked Questions (FAQs)

1What are the sectors where data mining is widely used?

Usually, data mining is seeing huge applications in companies that are focusing on a strong consumer focus, such as marketing organizations, communication, financial, and retail. Data mining methods help companies determine the prices and position their products based on their customer preferences.

Data mining also makes it easy for any retailer to develop promotions and products to appeal to certain customer segments and eventually enhance their sales. With data being important for every industry, the usage of data mining has increased to a huge extent in every sector. Some of the sectors where data mining is being widely used are Education, CRM, Fraud detection, Financial banking, Customer segmentation, Research analysis, Criminal investigation, and Manufacturing engineering.

2What are some of the most preferred data mining tools?

There are plenty of data mining tools available in the market, which are both proprietary and open-source. For different levels of sophistication, there are different tools available in the market. Every tool has been designed to implement certain data mining strategies to make working easier, but the only difference lies in the sophistication that the customers require. Some of the most preferred data mining tools are Teradata, Knime, Oracle data mining, Weka, Rattle, IBM SPSS modeler, and Kaggle.

3What are the key advantages of data mining?

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