[Rasch] Standard Error of Raw Score

Mike Linacre (RMT) rmt at rasch.org
Thu Apr 26 04:35:06 EST 2007

Hu Nan et al.:

Under Rasch conditions, the variance of the raw score is the sum of the 
variance of the individual observations. This is P*(1-P) in the dichotomous 
case, where P is the Rasch probability.  So the standard error of the raw 
score would be sqrt (sum (P*(1-P))) for the observations comprising the raw 

Mike Linacre
Editor, Rasch Measurement Transactions
rmt at rasch.org www.rasch.org/rmt/ Latest RMT:  20:4 Spring 2007
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