Educational data mining

Educational data mining (EDM) is a research field concerned with the application of data mining, machine learning and statistics to information generated from educational settings (e.g., universities and intelligent tutoring systems). Universities are data rich environments with commercially valuable data collected incidental to academic purpose, but sought by outside interests. Grey literature is another academic data resource requiring stewardship.^[1] At a high level, the field seeks to develop and improve methods for exploring this data, which often has multiple levels of meaningful hierarchy, in order to discover new insights about how people learn in the context of such settings.^[2] In doing so, EDM has contributed to theories of learning investigated by researchers in educational psychology and the learning sciences.^[3] The field is closely tied to that of learning analytics, and the two have been compared and contrasted.^[4]

Educational data mining refers to techniques, tools, and research designed for automatically extracting meaning from large repositories of data generated by or related to people's learning activities in educational settings.^[5] Quite often, this data is extensive, fine-grained, and precise. For example, several learning management systems (LMSs) track information such as when each student accessed each learning object, how many times they accessed it, and how many minutes the learning object was displayed on the user's computer screen. As another example, intelligent tutoring systems record data every time a learner submits a solution to a problem. They may collect the time of the submission, whether or not the solution matches the expected solution, the amount of time that has passed since the last submission, the order in which solution components were entered into the interface, etc. The precision of this data is such that even a fairly short session with a computer-based learning environment (e.g. 30 minutes) may produce a large amount of process data for analysis.

In other cases, the data is less fine-grained. For example, a student's university transcript may contain a temporally ordered list of courses taken by the student, the grade that the student earned in each course, and when the student selected or changed his or her academic major. EDM leverages both types of data to discover meaningful information about different types of learners and how they learn, the structure of domain knowledge, and the effect of instructional strategies embedded within various learning environments. These analyses provide new information that would be difficult to discern by looking at the raw data. For example, analyzing data from an LMS may reveal a relationship between the learning objects that a student accessed during the course and their final course grade. Similarly, analyzing student transcript data may reveal a relationship between a student's grade in a particular course and their decision to change their academic major. Such information provides insight into the design of learning environments, which allows students, teachers, school administrators, and educational policy makers to make informed decisions about how to interact with, provide, and manage educational resources.

While the analysis of educational data is not itself a new practice, recent advances in educational technology, including the increase in computing power and the ability to log fine-grained data about students' use of a computer-based learning environment, have led to an increased interest in developing techniques for analyzing the large amounts of data generated in educational settings. This interest translated into a series of EDM workshops held from 2000 to 2007 as part of several international research conferences.^[6] In 2008, a group of researchers established what has become an annual international research conference on EDM, the first of which took place in Montreal, Quebec, Canada.^[7]

As interest in EDM continued to increase, EDM researchers established an academic journal in 2009, the Journal of Educational Data Mining, for sharing and disseminating research results. In 2011, EDM researchers established the International Educational Data Mining Society to connect EDM researchers and continue to grow the field.

With the introduction of public educational data repositories in 2008, such as the Pittsburgh Science of Learning Centre's (PSLC) DataShop and the National Center for Education Statistics (NCES), public data sets have made educational data mining more accessible and feasible, contributing to its growth.^[8]

Ryan S. Baker and Kalina Yacef ^[9] identified the following four goals of EDM:

1. Predicting students' future learning behavior – With the use of student modeling, this goal can be achieved by creating student models that incorporate the learner's characteristics, including detailed information such as their knowledge, behaviours and motivation to learn. The user experience of the learner and their overall satisfaction with learning are also measured.
2. Discovering or improving domain models – Through the various methods and applications of EDM, discovery of new and improvements to existing models is possible. Examples include illustrating the educational content to engage learners and determining optimal instructional sequences to support the student's learning style.
3. Studying the effects of educational support that can be achieved through learning systems.
4. Advancing scientific knowledge about learning and learners by building and incorporating student models, the field of EDM research and the technology and software used.

There are four main users and stakeholders involved with educational data mining. These include:

• Learners – Learners are interested in understanding student needs and methods to improve the learner's experience and performance.^[10] For example, learners can also benefit from the discovered knowledge by using the EDM tools to suggest activities and resources that they can use based on their interactions with the online learning tool and insights from past or similar learners.^[11] For younger learners, educational data mining can also inform parents about their child's learning progress.^[12] It is also necessary to effectively group learners in an online environment. The challenge is using the complex data to learn and interpret these groups through developing actionable models.^[13]
• Educators – Educators attempt to understand the learning process and the methods they can use to improve their teaching methods.^[10] Educators can use the applications of EDM to determine how to organize and structure the curriculum, the best methods to deliver course information and the tools to use to engage their learners for optimal learning outcomes.^[14] In particular, the distillation of data for human judgment technique provides an opportunity for educators to benefit from EDM because it enables educators to quickly identify behavioural patterns, which can support their teaching methods during the duration of the course or to improve future courses. Educators can determine indicators that show student satisfaction and engagement of course material, and also monitor learning progress.^[14]
• Researchers – Researchers focus on the development and the evaluation of data mining techniques for effectiveness.^[10] A yearly international conference for researchers began in 2008. The wide range of topics in EDM ranges from using data mining to improve institutional effectiveness to student performance.
• Administrators – Administrators are responsible for allocating the resources for implementation in institutions.^[10] As institutions are increasingly held responsible for student success, the administering of EDM applications are becoming more common in educational settings. Faculty and advisors are becoming more proactive in identifying and addressing at-risk students. However, it is sometimes a challenge to get the information to the decision makers to administer the application in a timely and efficient manner.

As research in the field of educational data mining has continued to grow, a myriad of data mining techniques have been applied to a variety of educational contexts. In each case, the goal is to translate raw data into meaningful information about the learning process in order to make better decisions about the design and trajectory of a learning environment. Thus, EDM generally consists of four phases:^[3][6]

1. The first phase of the EDM process (not counting pre-processing) is discovering relationships in data. This involves searching through a repository of data from an educational environment with the goal of finding consistent relationships between variables. Several algorithms for identifying such relationships have been utilized, including classification, regression, clustering, factor analysis, social network analysis, association rule mining, and sequential pattern mining.
2. Discovered relationships must then be validated in order to avoid overfitting.
3. Validated relationships are applied to make predictions about future events in the learning environment.
4. Predictions are used to support decision-making processes and policy decisions.

During phases 3 and 4, data is often visualized or in some other way distilled for human judgment.^[3] A large amount of research has been conducted in best practices for visualizing data.

Of the general categories of methods mentioned, prediction, clustering and relationship mining are considered universal methods across all types of data mining; however, Discovery with Models and Distillation of Data for Human Judgment are considered more prominent approaches within educational data mining.^[8]

In the Discovery with Model method, a model is developed via prediction, clustering or by human reasoning knowledge engineering and then used as a component in another analysis, namely in prediction and relationship mining.^[8] In the prediction method use, the created model's predictions are used to predict a new variable.^[8] For the use of relationship mining, the created model enables the analysis between new predictions and additional variables in the study.^[8] In many cases, discovery with models uses validated prediction models that have proven generalizability across contexts.

Key applications of this method include discovering relationships between student behaviors, characteristics and contextual variables in the learning environment.^[8] Further discovery of broad and specific research questions across a wide range of contexts can also be explored using this method.

Humans can make inferences about data that may be beyond the scope in which an automated data mining method provides.^[8] For the use of education data mining, data is distilled for human judgment for two key purposes, identification and classification.^[8]

For the purpose of identification, data is distilled to enable humans to identify well-known patterns, which may otherwise be difficult to interpret. For example, the learning curve, classic to educational studies, is a pattern that clearly reflects the relationship between learning and experience over time.

Data is also distilled for the purposes of classifying features of data, which for educational data mining, is used to support the development of the prediction model. Classification helps expedite the development of the prediction model, tremendously.

The goal of this method is to summarize and present the information in a useful, interactive and visually appealing way in order to understand the large amounts of education data and to support decision making.^[10] In particular, this method is beneficial to educators in understanding usage information and effectiveness in course activities.^[10] Key applications for the distillation of data for human judgment include identifying patterns in student learning, behavior, opportunities for collaboration and labeling data for future uses in prediction models.^[8]

A list of the primary applications of EDM is provided by Cristobal Romero and Sebastian Ventura.^[6] In their taxonomy, the areas of EDM application are:

• Analysis and visualization of data
• Providing feedback for supporting instructors
• Recommendations for students
• Predicting student performance
• Student modeling
• Detecting undesirable student behaviors
• Grouping students
• Social network analysis
• Developing concept maps
• Constructing courseware – EDM can be applied to course management systems such as open source Moodle. Moodle contains usage data that includes various activities by users such as test results, amount of readings completed and participation in discussion forums. Data mining tools can be used to customize learning activities for each user and adapt the pace in which the student completes the course. This is in particularly beneficial for online courses with varying levels of competency.
• Planning and scheduling

New research on mobile learning environments also suggests that data mining can be useful. Data mining can be used to help provide personalized content to mobile users, despite the differences in managing content between mobile devices and standard PCs and web browsers.

New EDM applications will focus on allowing non-technical users use and engage in data mining tools and activities, making data collection and processing more accessible for all users of EDM. Examples include statistical and visualization tools that analyzes social networks and their influence on learning outcomes and productivity.^[15]

1. In October 2013, Coursera offered a free online course on "Big Data in Education" that taught how and when to use key methods for EDM.^[16] This course moved to edX in the summer of 2015,^[17] and has continued to run on edX annually since then. A course archive is now available online.^[18]
2. Teachers College, Columbia University offers a MS in Learning Analytics.^[19]

Considerable amounts of EDM work are published at the peer-reviewed International Conference on Educational Data Mining, organized by the International Educational Data Mining Society.

• 1st International Conference on Educational Data Mining (2008)^[20] – Montreal, Canada
• 2nd International Conference on Educational Data Mining (2009)^[21] – Cordoba, Spain
• 3rd International Conference on Educational Data Mining (2010)^[22] – Pittsburgh, PA, USA
• 4th International Conference on Educational Data Mining (2011)^[23] – Eindhoven, Netherlands
• 5th International Conference on Educational Data Mining (2012)^[24] – Chania, Greece
• 6th International Conference on Educational Data Mining (2013)^[25] – Memphis, TN, USA
• 7th International Conference on Educational Data Mining (2014)^[26] – London, UK
• 8th International Conference on Educational Data Mining] (2015)^[27] – Madrid, Spain
• 9th International Conference on Educational Data Mining] (2016)^[28] – Raleigh, NC, USA
• 10th International Conference on Educational Data Mining] (2017)^[29] – Wuhan, China
• 11th International Conference on Educational Data Mining] (2018)^[30] – Buffalo, NY, USA
• 12th International Conference on Educational Data Mining] (2019)^[31] – Montréal, QC, Canada
• 13th International Conference on Educational Data Mining] (2020)^[32] – Virtual
• 14th International Conference on Educational Data Mining (2021)^[33] – Paris, France

EDM papers are also published in the Journal of Educational Data Mining (JEDM).

Many EDM papers are routinely published in related conferences, such as Artificial Intelligence and Education, Intelligent Tutoring Systems, and User Modeling, Adaptation, and Personalization.

In 2011, Chapman & Hall/CRC Press, Taylor and Francis Group published the first Handbook of Educational Data Mining. This resource was created for those that are interested in participating in the educational data mining community.^[15]

In 2010, the Association for Computing Machinery's KDD Cup was conducted using data from an educational setting.^[34] The data set was provided by the DataShop, and it consisted of over 1,000,000 data points from students using a cognitive tutor.^[35] Six hundred teams competed for over US$8,000 in prize money (which was donated by Facebook). The goal for contestants was to design an algorithm that, after learning from the provided data, would make the most accurate predictions from new data. The winners submitted an algorithm that utilized feature generation (a form of representation learning), random forests, and Bayesian networks.^[36]

Along with technological advancements are costs and challenges associated with implementing EDM applications. These include the costs to store logged data and the cost associated with hiring staff dedicated to managing data systems.^[37] Moreover, data systems may not always integrate seamlessly with one another and even with the support of statistical and visualization tools, creating one simplified version of the data can be difficult.^[37] Furthermore, choosing which data to mine and analyze can also be challenging,^[37] making the initial stages very time-consuming and labor-intensive. From beginning to end, the EDM strategy and implementation requires one to uphold privacy and ethics^[37] for all stakeholders involved.

• Generalizability – Research in EDM may be specific to the particular educational setting and time in which the research was conducted, and as such, may not be generalizable to other institutions. Research also indicates that the field of educational data mining is concentrated in western countries and cultures and subsequently, other countries and cultures may not be represented in the research and findings.^[9] Development of future models should consider applications across multiple contexts.
• Privacy – Individual privacy is a continued concern for the application of data mining tools. With free, accessible and user-friendly tools in the market, students and their families may be at risk from the information that learners provide to the learning system, in hopes to receive feedback that will benefit their future performance. As users become savvy in their understanding of online privacy, administrators of educational data mining tools need to be proactive in protecting the privacy of their users and be transparent about how and with whom the information will be used and shared. Development of EDM tools should consider protecting individual privacy while still advancing the research in this field.
• Plagiarism – Plagiarism detection is an ongoing challenge for educators and faculty whether in the classroom or online. However, due to the complexities associated with detecting and preventing digital plagiarism in particular, educational data mining tools are not currently sophisticated enough to accurately address this issue. Thus, the development of predictive capability in plagiarism-related issues should be an area of focus in future research.
• Adoption – It is unknown how widespread the adoption of EDM is and the extent to which institutions have applied and considered implementing an EDM strategy. As such, it is unclear whether there are any barriers that prevent users from adopting EDM in their educational settings.

• Big data
• Data mining
• Education
• Educational technology
• Glossary of education terms
• Learning analytics
• Machine learning
• Statistics