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Data miningis the process of extracting and discovering patterns in largedata setsinvolving methods at the intersection ofmachine learning,statistics,anddatabase systems.[1]Data mining is aninterdisciplinarysubfield ofcomputer scienceandstatisticswith an overall goal of extracting information (with intelligent methods) from a data set and transforming the information into a comprehensible structure for further use.[1][2][3][4]Data mining is the analysis step of the "knowledge discovery in databases"process, or KDD.[5]Aside from the raw analysis step, it also involves database anddata managementaspects,data pre-processing,modelandinferenceconsiderations, interestingness metrics,complexityconsiderations, post-processing of discovered structures,visualization,andonline updating.[1]

The term "data mining" is amisnomerbecause the goal is the extraction ofpatternsand knowledge from large amounts of data, not theextraction (mining) of data itself.[6]It also is abuzzword[7]and is frequently applied to any form of large-scale data orinformation processing(collection,extraction,warehousing,analysis, and statistics) as well as any application ofcomputer decision support system,includingartificial intelligence(e.g., machine learning) andbusiness intelligence.Often the more general terms (large scale)data analysisandanalytics—or, when referring to actual methods,artificial intelligenceandmachine learning—are more appropriate.

The actual data mining task is the semi-automaticor automatic analysis of large quantities of data to extract previously unknown, interesting patterns such as groups of data records (cluster analysis), unusual records (anomaly detection), anddependencies(association rule mining,sequential pattern mining). This usually involves using database techniques such asspatial indices.These patterns can then be seen as a kind of summary of the input data, and may be used in further analysis or, for example, in machine learning andpredictive analytics.For example, the data mining step might identify multiple groups in the data, which can then be used to obtain more accurate prediction results by adecision support system.Neither the data collection, data preparation, nor result interpretation and reporting is part of the data mining step, although they do belong to the overall KDD process as additional steps.

The difference betweendata analysisand data mining is that data analysis is used to test models and hypotheses on the dataset, e.g., analyzing the effectiveness of amarketing campaign,regardless of the amount of data. In contrast, data mining uses machine learning and statistical models to uncover clandestine or hidden patterns in a large volume of data.[8]

The related termsdata dredging,data fishing,anddata snoopingrefer to the use of data mining methods to sample parts of a larger population data set that are (or may be) too small for reliable statistical inferences to be made about the validity of any patterns discovered. These methods can, however, be used in creating new hypotheses to test against the larger data populations.

Etymology

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In the 1960s, statisticians and economists used terms likedata fishingordata dredgingto refer to what they considered the bad practice of analyzing data without ana-priorihypothesis. The term "data mining" was used in a similarly critical way by economistMichael Lovellin an article published in theReview of Economic Studiesin 1983.[9][10]Lovell indicates that the practice "masquerades under a variety of aliases, ranging from" experimentation "(positive) to" fishing "or" snooping "(negative).

The termdata miningappeared around 1990 in the database community, with generally positive connotations. For a short time in 1980s, the phrase "database mining" ™, was used, but since it was trademarked by HNC, aSan Diego–based company, to pitch their Database Mining Workstation;[11]researchers consequently turned todata mining.Other terms used includedata archaeology,information harvesting,information discovery,knowledge extraction,etc.Gregory Piatetsky-Shapirocoined the term "knowledge discovery in databases" for the first workshop on the same topic(KDD-1989)and this term became more popular in theAIandmachine learningcommunities. However, the term data mining became more popular in the business and press communities.[12]Currently, the termsdata miningandknowledge discoveryare used interchangeably.

Background

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The manual extraction of patterns fromdatahas occurred for centuries. Early methods of identifying patterns in data includeBayes' theorem(1700s) andregression analysis(1800s).[13]The proliferation, ubiquity and increasing power of computer technology have dramatically increased data collection, storage, and manipulation ability. Asdata setshave grown in size and complexity, direct "hands-on" data analysis has increasingly been augmented with indirect, automated data processing, aided by other discoveries in computer science, specially in the field of machine learning, such asneural networks,cluster analysis,genetic algorithms(1950s),decision treesanddecision rules(1960s), andsupport vector machines(1990s). Data mining is the process of applying these methods with the intention of uncovering hidden patterns.[14]in large data sets. It bridges the gap fromapplied statisticsand artificial intelligence (which usually provide the mathematical background) todatabase managementby exploiting the way data is stored and indexed in databases to execute the actual learning and discovery algorithms more efficiently, allowing such methods to be applied to ever-larger data sets.

Process

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Theknowledge discovery in databases (KDD) processis commonly defined with the stages:

  1. Selection
  2. Pre-processing
  3. Transformation
  4. Data mining
  5. Interpretation/evaluation.[5]

It exists, however, in many variations on this theme, such as theCross-industry standard process for data mining(CRISP-DM) which defines six phases:

  1. Business understanding
  2. Data understanding
  3. Data preparation
  4. Modeling
  5. Evaluation
  6. Deployment

or a simplified process such as (1) Pre-processing, (2) Data Mining, and (3) Results Validation.

Polls conducted in 2002, 2004, 2007 and 2014 show that the CRISP-DM methodology is the leading methodology used by data miners.[15][16][17][18]

The only other data mining standard named in these polls wasSEMMA.However, 3–4 times as many people reported using CRISP-DM. Several teams of researchers have published reviews of data mining process models,[19]and Azevedo and Santos conducted a comparison of CRISP-DM and SEMMA in 2008.[20]

Pre-processing

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Before data mining algorithms can be used, a target data set must be assembled. As data mining can only uncover patterns actually present in the data, the target data set must be large enough to contain these patterns while remaining concise enough to be mined within an acceptable time limit. A common source for data is adata martordata warehouse.Pre-processing is essential to analyze themultivariatedata sets before data mining. The target set is then cleaned. Data cleaning removes the observations containingnoiseand those withmissing data.

Data mining

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Data mining involves six common classes of tasks:[5]

  • Anomaly detection(outlier/change/deviation detection) – The identification of unusual data records, that might be interesting or data errors that require further investigation due to being out of standard range.
  • Association rule learning(dependency modeling) – Searches for relationships between variables. For example, a supermarket might gather data on customer purchasing habits. Using association rule learning, the supermarket can determine which products are frequently bought together and use this information for marketing purposes. This is sometimes referred to as market basket analysis.
  • Clustering– is the task of discovering groups and structures in the data that are in some way or another "similar", without using known structures in the data.
  • Classification– is the task of generalizing known structure to apply to new data. For example, an e-mail program might attempt to classify an e-mail as "legitimate" or as "spam".
  • Regression– attempts to find a function that models the data with the least error that is, for estimating the relationships among data or datasets.
  • Summarization– providing a more compact representation of the data set, including visualization and report generation.

Results validation

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An example of data produced bydata dredgingthrough a bot operated by statistician Tyler Vigen, apparently showing a close link between the best word winning a spelling bee competition and the number of people in the United States killed by venomous spiders

Data mining can unintentionally be misused, producing results that appear to be significant but which do not actually predict future behavior and cannot bereproducedon a new sample of data, therefore bearing little use. This is sometimes caused by investigating too many hypotheses and not performing properstatistical hypothesis testing.A simple version of this problem inmachine learningis known asoverfitting,but the same problem can arise at different phases of the process and thus a train/test split—when applicable at all—may not be sufficient to prevent this from happening.[21]

The final step of knowledge discovery from data is to verify that the patterns produced by the data mining algorithms occur in the wider data set. Not all patterns found by the algorithms are necessarily valid. It is common for data mining algorithms to find patterns in the training set which are not present in the general data set. This is calledoverfitting.To overcome this, the evaluation uses atest setof data on which the data mining algorithm was not trained. The learned patterns are applied to this test set, and the resulting output is compared to the desired output. For example, a data mining algorithm trying to distinguish "spam" from "legitimate" e-mails would be trained on atraining setof sample e-mails. Once trained, the learned patterns would be applied to the test set of e-mails on which it hadnotbeen trained. The accuracy of the patterns can then be measured from how many e-mails they correctly classify. Several statistical methods may be used to evaluate the algorithm, such asROC curves.

If the learned patterns do not meet the desired standards, it is necessary to re-evaluate and change the pre-processing and data mining steps. If the learned patterns do meet the desired standards, then the final step is to interpret the learned patterns and turn them into knowledge.

Research

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The premier professional body in the field is theAssociation for Computing Machinery's (ACM) Special Interest Group (SIG) on Knowledge Discovery and Data Mining (SIGKDD).[22][23]Since 1989, this ACM SIG has hosted an annual international conference and published its proceedings,[24]and since 1999 it has published a biannualacademic journaltitled "SIGKDD Explorations".[25]

Computer science conferences on data mining include:

Data mining topics are also present in manydata management/database conferencessuch as the ICDE Conference,SIGMOD ConferenceandInternational Conference on Very Large Data Bases.

Standards

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There have been some efforts to define standards for the data mining process, for example, the 1999 EuropeanCross Industry Standard Process for Data Mining(CRISP-DM 1.0) and the 2004Java Data Miningstandard (JDM 1.0). Development on successors to these processes (CRISP-DM 2.0 and JDM 2.0) was active in 2006 but has stalled since. JDM 2.0 was withdrawn without reaching a final draft.

For exchanging the extracted models—in particular for use inpredictive analytics—the key standard is thePredictive Model Markup Language(PMML), which is anXML-based language developed by the Data Mining Group (DMG) and supported as exchange format by many data mining applications. As the name suggests, it only covers prediction models, a particular data mining task of high importance to business applications. However, extensions to cover (for example)subspace clusteringhave been proposed independently of the DMG.[26]

Notable uses

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Main article:Examples of data mining
See also:Category:Applied data mining

Data mining is used wherever there is digital data available. Notableexamples of data miningcan be found throughout business, medicine, science, finance, construction, and surveillance.

Privacy concerns and ethics

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While the term "data mining" itself may have no ethical implications, it is often associated with the mining of information in relation touser behavior(ethical and otherwise).[27]

The ways in which data mining can be used can in some cases and contexts raise questions regardingprivacy,legality, andethics.[28]In particular, data mining government or commercial data sets fornational securityorlaw enforcementpurposes, such as in theTotal Information AwarenessProgram or inADVISE,has raised privacy concerns.[29][30]

Data mining requires data preparation which uncovers information or patterns which compromiseconfidentialityandprivacyobligations. A common way for this to occur is throughdata aggregation.Data aggregationinvolves combining data together (possibly from various sources) in a way that facilitates analysis (but that also might make identification of private, individual-level data deducible or otherwise apparent).[31]This is not data miningper se,but a result of the preparation of data before—and for the purposes of—the analysis. The threat to an individual's privacy comes into play when the data, once compiled, cause the data miner, or anyone who has access to the newly compiled data set, to be able to identify specific individuals, especially when the data were originally anonymous.[32]

It is recommended[according to whom?]to be aware of the followingbeforedata are collected:[31]

  • The purpose of the data collection and any (known) data mining projects.
  • How the data will be used.
  • Who will be able to mine the data and use the data and their derivatives.
  • The status of security surrounding access to the data.
  • How collected data can be updated.

Data may also be modified so as tobecomeanonymous, so that individuals may not readily be identified.[31]However, even "anonymized"data sets can potentially contain enough information to allow identification of individuals, as occurred when journalists were able to find several individuals based on a set of search histories that were inadvertently released by AOL.[33]

The inadvertent revelation ofpersonally identifiable informationleading to the provider violates Fair Information Practices. This indiscretion can cause financial, emotional, or bodily harm to the indicated individual. In one instance ofprivacy violation,the patrons of Walgreens filed a lawsuit against the company in 2011 for selling prescription information to data mining companies who in turn provided the data to pharmaceutical companies.[34]

Situation in Europe

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Europehas rather strong privacy laws, and efforts are underway to further strengthen the rights of the consumers. However, theU.S.–E.U. Safe Harbor Principles,developed between 1998 and 2000, currently effectively expose European users to privacy exploitation by U.S. companies. As a consequence ofEdward Snowden'sglobal surveillance disclosure,there has been increased discussion to revoke this agreement, as in particular the data will be fully exposed to theNational Security Agency,and attempts to reach an agreement with the United States have failed.[35]

In the United Kingdom in particular there have been cases of corporations using data mining as a way to target certain groups of customers forcing them to pay unfairly high prices. These groups tend to be people of lower socio-economic status who are not savvy to the ways they can be exploited in digital market places.[36]

Situation in the United States

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In the United States, privacy concerns have been addressed by theUS Congressvia the passage of regulatory controls such as theHealth Insurance Portability and Accountability Act(HIPAA). The HIPAA requires individuals to give their "informed consent" regarding information they provide and its intended present and future uses. According to an article inBiotech Business Week,"'[i]n practice, HIPAA may not offer any greater protection than the longstanding regulations in the research arena,' says the AAHC. More importantly, the rule's goal of protection through informed consent is approach a level of incomprehensibility to average individuals."[37]This underscores the necessity for data anonymity in data aggregation and mining practices.

U.S. information privacy legislation such as HIPAA and theFamily Educational Rights and Privacy Act(FERPA) applies only to the specific areas that each such law addresses. The use of data mining by the majority of businesses in the U.S. is not controlled by any legislation.

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Situation in Europe

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UnderEuropean copyrightdatabase laws,the mining of in-copyright works (such as byweb mining) without the permission of the copyright owner is not legal. Where a database is pure data in Europe, it may be that there is no copyright—but database rights may exist, so data mining becomes subject tointellectual propertyowners' rights that are protected by theDatabase Directive.On the recommendation of theHargreaves review,this led to the UK government to amend its copyright law in 2014 to allow content mining as alimitation and exception.[38]The UK was the second country in the world to do so after Japan, which introduced an exception in 2009 for data mining. However, due to the restriction of theInformation Society Directive(2001), the UK exception only allows content mining for non-commercial purposes. UK copyright law also does not allow this provision to be overridden by contractual terms and conditions. Since 2020 also Switzerland has been regulating data mining by allowing it in the research field under certain conditions laid down by art. 24d of the Swiss Copyright Act. This new article entered into force on 1 April 2020.[39]

TheEuropean Commissionfacilitated stakeholder discussion on text and data mining in 2013, under the title of Licences for Europe.[40]The focus on the solution to this legal issue, such as licensing rather than limitations and exceptions, led to representatives of universities, researchers, libraries, civil society groups andopen accesspublishers to leave the stakeholder dialogue in May 2013.[41]

Situation in the United States

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US copyright law,and in particular its provision forfair use,upholds the legality of content mining in America, and other fair use countries such as Israel, Taiwan and South Korea. As content mining is transformative, that is it does not supplant the original work, it is viewed as being lawful under fair use. For example, as part of theGoogle Book settlementthe presiding judge on the case ruled that Google's digitization project of in-copyright books was lawful, in part because of the transformative uses that the digitization project displayed—one being text and data mining.[42]

Software

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See also:Category:Data mining and machine learning software

Free open-source data mining software and applications

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The following applications are available under free/open-source licenses. Public access to application source code is also available.

Proprietary data-mining software and applications

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The following applications are available under proprietary licenses.

See also

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Methods
Application domains
Application examples
Main article:Examples of data mining
See also:Category:Applied data mining
Related topics

For more information about extracting information out of data (as opposed toanalyzingdata), see:

Other resources

References

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Further reading

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