[Rasch] Use of e in the Rasch model
yk0271 at yahoo.co.jp
Tue Sep 6 03:45:44 EST 2011
I have a question about the formula of the Rasch or IRT model. Why is e (=2.718) used in the formula? Why is not it 10? Because e is close to 3, why isn’t 3 used for the formula instead
of e? I have been having this question for
a long time, but all the Rasch and IRT books I have read treat as given the use of e (=2.718) in the formula. If anyone gives me an answer,
it will be very appreciated.
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