Implement an Elo ratings system on math practice data to track student and test item development

Elo ratings are popular in many contexts, but also have found their application in learning contexts, as it allows for simple tracking of the development of both the ability of students, and the difficulty of test items, over time. 

This project will ask you to calculate and use Elo ratings for exploratory data analysis. How do development traces look like, can you visually identify different groups of students? Are students within schools more alike than students between schools? What patterns of study time can be charted? And more. 

Any programming language can be used, data will be made available in a simple CSV file. 

Literature: 
Klinkenberg, S.; Straatemeier, M. & van der Maas, H. L. J. (2011). Computer adaptive practice of Maths ability using a new item response model for on the fly ability and difficulty estimation. Computers & Education, 57, 1813-1824