 Date: 2016-06-29 00:36:46Statistics Statistical models Psychometrics Machine learning Educational psychology Estimation theory Item response theory Rasch model Cross-validation Regression analysis SAT | |  Evaluating Problem Difficulty Rankings Using Sparse Student Response Data Ari BADER-NATAL 1 , Jordan POLLACK DEMO Lab, Brandeis University Abstract. Problem difficulty estimates play important roles in a wide variety of
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