[Rasch] Measure from one item response

Stuart Luppescu slu at ccsr.uchicago.edu
Sat Sep 22 08:32:39 EST 2012


On Sat, 2012-09-22 at 08:15 +1300, Mike Linacre wrote:
> Stuart:
> 
> Yes, we can do the calculation, but what is the range of responses? 0-4 or 
> 1-5? Or is the bottom step difficulty, 0, a place-holder, so that the 
> response range is 1-4?

Right. The response range is 1-4, so the bottom step difficulty is the
place holder.

> One method is at http://www.rasch.org/rmt/rmt122q.htm with L=1. This is 
> awkward by hand, but straightforward with Excel.
> 
> OK?

Great. Thanks very much.

-- 
Stuart Luppescu <slu at ccsr.uchicago.edu>
University of Chicago
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