[Rasch] Rasch Scoring

Juanito Talili talilij at yahoo.com
Tue Sep 20 17:49:29 EST 2011

We are using Rasch model to develop our test questionnaire.  The end goal of our tests is to compute scores.  Assuming that after Rasch analysis using n=400 students, I arrived a math test questionnaire consisted of 50 items.  I will now administer the questionaire to another students (say 200) and then compute the scores for each of the students.  Two scenarios:
Scenario 1: Using n=400, I will save the person measures and item measures, then use such values to compute the scores of the 200 students.
Scenario 2:  I will not use any values from the previous analysis.  Instead, I will just use the data obtained from the 200 students then run directly the winsteps.
Question:  Which scenario is the best practice in using Rasch Analysis?
Your comments are very important.
Thank you.
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