E. Model-data Fit questions

MODFIT questions

Q1. Where can I get instruction for MODFIT?

A1: You may review MODFIT instructions here.

Q2. Why isn't my MODFIT working?

A2: MODFIT uses Microsoft Excel Macros for analysis. On certain systems, such as Windows Server 2003, the macros are disabled by default because the security level was set to High and digitally signed Trusted Certificate is not attached to the macros. Please use the following procedure to enable the macro:

1.Select the Tools menu option and then select Macro and Security. In the resulting Security dialog, set the security level to Medium by clicking the Medium radio button.

2.Close the file and any other instances of the application currently running on the computer (close all applications that also use the application you are currently running).

3.Open the file again and examine the certificate of trust details and set the Always trust macros from this publisher box if you trust the certificate issued by the publisher. Click the Enable button to allow the macro to run.

Q3. Do I need a password to run MODFIT?

A3: No. As you do not want to change the macros and formulas in MODFIT, you do not need a password to run the program.

Q4. Why is MODFIT read-only?

A4: MODFIT is read-only so the macros and formulas will not be changed by accident. You may save the file as a different file name when the analysis is finished.

Q5. Who wrote MODFIT?

Dr. Stephen Stark, currently an associate professor at University of South Florida, wrote the program while studying at University of Illinois at Urbana-Champaign. You may find more information about him here.

Q6. How do I cite this work?

You may cite MODFIT using 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 Unpublished manuscript.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.

Q7. How can I obtain a distribution copy of MODFIT?

A5: You may download MODFIT for Distribution here.

Q8. Where can I find Example Data and Results of MODFIT?

A6: You may download Example Data and Results of MODFIT here.

Q9. How can I obtain a full copy of MODFIT?

A5: For academic and research proposes, you may e-mail the webmaster to request a full copy of MODFIT.