Raw scores as measures

Raw scores are used to construct Rasch measures, but their relationship is non-linear. But the relationship is often linear enough for practical purposes.

 

If you want to plot raw scores instead of Rasch measures on the x-axis of a graph or plot, then rescale the Rasch measures to approximate raw scores:

 

In your Table 20.1, it says something like:

Predicting Score from Measure: Score = Measure * 8.2680 + 38.9511

 

Then try

USCALE= 8.2680   <- use the numbers from your Table 20.1

UIMEAN= 38.9511

 

Now produce the Graphs with Absolute scaling.