[Rasch] Why are Rasch measures linear?

Trevor Bond trevor.bond at jcu.edu.au
Tue Sep 4 12:17:32 EST 2007

At 10:05 PM -0400 9/3/07, commons wrote:
>I have tried to do this with Rasch scaled stage scores and Orders of 
>Hierarchical Complexity.  One might think that the orders of 
>hierarchical complexity would all be equal distanced because each 
>higher order organizes two or more less hierarchically complex 
>actions.  This is true of all orders.  But we treat the order of 
>hierarchical complexity as an ordinal.  Empirically we do not get 
>equal spacing on the Rasch scale of item from the same sequence.

Your orders are not equi-distant Michael

but the Rasch logit interval are....

Trevor G BOND Ph D
Professor and Head of Dept
Educational Psychology, Counselling & Learning Needs
D2-2F-01A EPCL Dept.
Hong Kong Institute of Education
10 Lo Ping Rd, Tai Po
New Territories HONG KONG

Voice: (852) 2948 8473
Fax:  (852) 2948 7983
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