R.J. Site

 

Glass N Logo at an angle.

 

Material related to The Theory and Application of Item Response Theory (2nd Edition)

Data & Output Files

Errata (Second Edition; Last updated on 5/10/23)

Appendices (Second Edition)

Errata (First Edition; Last updated on 5/7/20)

Dimensionality Assessment

Software URLs and other interesting sites

Software for Item Response Theory

Software for Latent Class Analysis

The following software is available for Wintel or compatible chips
LCA2.exe (Pentium/Compatible Chips)

For more information on LCA software and sites click on
http://www.education.umd.edu/EDMS/Latent/Dayton.html

This link comes from a very useful site, Dr. Dayton's site:
https://education.umd.edu/directory/faculty/c-mitchell-dayton

For more information please contact R.J. De Ayala at rdeayala2@unl.edu.

For more information on our program, QQPM, please visit our site at

http://cehs.unl.edu/edpsych/quantitative-qualitative-psychometric-methods

The Four Seasons in Nebraska

Spring Field
Late May, 95 degrees Fahrenheit; This field has not been cultivated, the two on either side have.
Summer Field
Early September, 101 degrees Fahrenheit; Soybeans with corn on the horizon.
Fall Field
Mid November, 8 degrees Fahrenheit; wind swept. The following month we experienced wind chill temperatures of -50 degrees (F).
Winter Field
Early February, 35 degrees Fahrenheit; The February thaw. Winter returned with a vengance in March.

Our State Official Weather Formation

Tornado

For a local picture:  http://www.starcitywebcam.com/

This site maintained by:
R.J. De Ayala
Quantitative, Qualitative, and Psychometric Methods
Department of Educational Psychology
University of Nebraska
Lincoln, NE 68588

 

"Do not speak unless you can improve upon the silence."
- Quaker Saying