Installing MODFIT (Full version)

1. For Office XP and earlier, please download MODFIT_2.zip by using theright mouse button and selecting 'Save Target as'. For Office 2007 and
later, please download MODFIT_3_for_2007.zip by using the right mouse button and selecting 'Save Target as'.

2. Please unzip file one in your target folder (any folder you create).

3. Create a new folder called 'Example Data & Results' in your target folder.

4. Unzip file2.zip into the 'Example Data & Results' folder and your are done.

Usage of this program is strictly for research purposes. No modification or for profit usage is permitted. All rights reserved by Steve Stark.

You may use one of the following citations:
Stark, S. (2001). MODFIT: A computer program for model-data fit. Unpublished manuscript. University of Illinois: Urbana-Champaign.
Stark, S. (2002). MODFIT: Plot theoretical item response functions and examine the fit of dichotomous or polytomous IRT models to response data [computer program]. Department of Psychology, University of Illinois at Urbana-Champaign.