To produce this plot from ConstructMap (formerly GradeMap), an analysis and graphical program distributed in association with the book "Constructing Measures: An Item Response Modeling Approach" by Mark Wilson (2004) Mahwah NJ: Lawrence Erlbaum Associates. bearcenter.berkeley.edu/GradeMap/
The ConstructMap (formerly GradeMap) option on the Output Files menu displays this box which enables a simple conversion of Winsteps control and data files into ConstructMap (formerly GradeMap) format. These files can then be imported by ConstructMap (formerly GradeMap) - see the ConstructMap (formerly GradeMap) User Guide. The files are displayed after they are created by Winsteps, so that you can edit them if you wish. Excel is used if it is available. If changes are made, save the file in tab-separated .txt format - which is expected by ConstructMap (formerly GradeMap). Here is a Model Specification File from Example0.txt.
Example ConstructMap (formerly GradeMap) Dialog:
Winsteps: Create Model Specification file
Winsteps: Create Student Data file
Winsteps: Launch ConstructMap (formerly GradeMap)
ConstructMap (formerly GradeMap) screen displays:
User name: admin
Password: bear
Menu: File
Menu: New Project
Remove: Yes
Menu: System
Menu: Import Model Specification
Import data: (your Model Specification file, e.g., lfsitems.txt)
Menu: File
Menu: Import Student Data
Import Student Data: (your Student Data file, e.g., lfschildren.txt)
Menu: View
Menu: Select Item Set
Click on: T
Click on: OK
Menu: Estimation Tasks
Menu: Compute
Accept: Yes
EAP: No
Menu: Reports & Maps etc.
Be patient! ConstructMap (formerly GradeMap) operates slowly with large files.