IRT Modeling Lab

D. Estimation of IRT Model Parameters

In this tutorial, we discuss the most commonly used IRT models for dichotomous and polytomous data. Polytomous models are capable of handling data two or more response options. We provide examples of input and output files for commonly used IRT calibration programs.

Dichotomous Data


Polytomous Data


Data files discussed in the Data Preparation section are available for download below.

  Agreeableness* Conscientiousness*
Calibration Sample agr1_cal.dat
agr2_cal.dat		 con1_cal.dat
con2_cal.dat
Validation Sample agr1_val.dat
agr2_val.dat		 con1_val.dat
con2_val.dat


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