Report on the Kaggle-Grockit Competition

The Grokit competition featured in RMT 25:3, p. 1329. Contestants were asked to predict students' responses based on those students' previous responses. The competition ended on Feb. 29, 2012. Many contestants used Rasch models. The most successful contestant was Steffen Rendle, Social Network Analysis, University of Konstanz. He used a "Factorization Machine" which estimates higher order interactions in very sparse datasets in order to predict new data. It is not known whether the increased complexity of the winning algorithm is matched by an increased utility in its predictions beyond those of a simple Rasch model.

Steffen Rendle was asked on the Kaggle blog: "What was your most important insight into the data?" He replied: "The most important predictors were the student, question and the time taken for answering a question. I also derived a variable that states how often a student has tried to answer a question before. Besides this, I only used the sub-track name and the game type. All other variables didn't help -- at least not in my experiments."

Report on the Kaggle-Grockit Competition ... Rasch Measurement Transactions, 2012, 25:4, 1340

Rasch Publications
Rasch Measurement Transactions (free, online)	Rasch Measurement research papers (free, online)	Probabilistic Models for Some Intelligence and Attainment Tests, Georg Rasch	Applying the Rasch Model 3rd. Ed., Bond & Fox	Best Test Design, Wright & Stone
Rating Scale Analysis, Wright & Masters	Introduction to Rasch Measurement, E. Smith & R. Smith	Introduction to Many-Facet Rasch Measurement, Thomas Eckes	Invariant Measurement: Using Rasch Models in the Social, Behavioral, and Health Sciences, George Engelhard, Jr.	Statistical Analyses for Language Testers, Rita Green
Rasch Models: Foundations, Recent Developments, and Applications, Fischer & Molenaar	Journal of Applied Measurement	Rasch models for measurement, David Andrich	Constructing Measures, Mark Wilson	Rasch Analysis in the Human Sciences, Boone, Stave, Yale
in Spanish:	Análisis de Rasch para todos, Agustín Tristán		Mediciones, Posicionamientos y Diagnósticos Competitivos, Juan Ramón Oreja Rodríguez

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