IRTtool.com webapplication (beta version)

Step 1: Upload datafile (SPSS, CSV or Tab delimited)

Step 2: Verify Data and Build a model

Step 3: Check estimates and figures

IRT Graphs

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ltm CRAN R-package by Dimitris Rizopoulos, Erasmus MC, 2009.
Web application written by Jeroen Ooms, Utrecht University, 2009.
Email: d.rizopoulos[at]erasmusmc[dot]nl || jeroenooms[at]gmail[dot]com.