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Converting Rasch scores into Probability
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Interpret Rasch scores by converting them into probability

John's Rasch score is 1.3.  Item A's item difficulty is 0.3. What is the probability of John's getting item A correctly?
 
Step 1: Substract item difficulty score from person measure:
1.3 - 0.3 = 1
Step 2: Enter an conversion function (logit --> probability) into an Excel cell.
=EXP(1)/(1+EXP(1))
 
This returns a value of
0.731058579
 
So John has a success probability of 73% when solving item A.

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