Person Response Functions (PRF) - Person Characteristic Curves |
To produce Person Response Functions (PRF) or Person Characteristic Curves using Winsteps,
1. Transpose the scored data matrix: Winsteps Output File menu. Transpose. So that the persons become the items.
2. ISGROUPS=0 in the transposed file if you want to model each person to have a unique rating scale.
3. Analyze the transposed file.
4. The Graphs menu now produces person curves, not item curves, but with a reversed x-axis.
5. To smooth the PRF, which is called Hanning, adjust the Smoothing slider
Here is an example from Example0.txt
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