[Rasch] Use of e in the Rasch model

Kenji Yamazaki yk0271 at yahoo.co.jp
Tue Sep 6 03:45:44 EST 2011

Hi all:


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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