[Rasch] Estimation

Anthony James luckyantonio2003 at yahoo.com
Wed Mar 5 07:04:15 EST 2008


Dear list members,
  I have a question about estimation in Rasch model. I tried to make it as short as possible. 
  Log [P(X=1)/P(X=0)] = b-d
  From this difference ability (b) and difficulty (d) cannot be estimated.
  1. How are the parameters of the model estimated in the Rasch model?
  2. Which property (or what part) of the simple logistic function brings about an interval scale?
  Regards
Anthony
       
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