[Rasch] sufficient statistic

Mike Linacre rmt at rasch.org
Mon Jul 16 09:12:58 EST 2012


We can derive the Rasch model from the axiom that the raw scores are the 
sufficient statistics for person ability and item difficulty.


This also demonstrates that most of Classical Test Theory, which acts as 
though the raw scores are sufficient statistics for decision-making, is 
based on the implicit assumption that the Rasch model holds for their data !!

Mike L.

Mike Linacre
rmt at rasch.org www.rasch.org/rmt/ Latest RMT 26:1 Summer 2012
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://mailinglist.acer.edu.au/pipermail/rasch/attachments/20120716/c84fdf97/attachment.html 

More information about the Rasch mailing list