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

To be emailed about new material on
please enter your email address here:

I want to Subscribe: & click below
I want to Unsubscribe: & click below

Please set your SPAM filter to accept emails from welcomes your comments:

Your email address (if you want us to reply):


ForumRasch Measurement Forum to discuss any Rasch-related topic

Go to Top of Page
Go to index of all Rasch Measurement Transactions
AERA members: Join the Rasch Measurement SIG and receive the printed version of RMT
Some back issues of RMT are available as bound volumes
Subscribe to Journal of Applied Measurement

Go to Institute for Objective Measurement Home Page. The Rasch Measurement SIG (AERA) thanks the Institute for Objective Measurement for inviting the publication of Rasch Measurement Transactions on the Institute's website,

Coming Rasch-related Events
June 23 - July 21, 2023, Fri.-Fri. On-line workshop: Practical Rasch Measurement - Further Topics (E. Smith, Winsteps),
Aug. 11 - Sept. 8, 2023, Fri.-Fri. On-line workshop: Many-Facet Rasch Measurement (E. Smith, Facets),


The URL of this page is