[Rasch] Measure from one item response

Mike Linacre rmt at rasch.org
Sat Sep 22 05:15:50 EST 2012


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?

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


Mike L.

Stuart wrote:
>Fellow Raschies, I have what I hope is a quick question: Is it possible
>to estimate a person measure based on one response to one item, given
>the item and step difficulty? For example, say for an item with
>difficulty 0.1; and step difficulties 0, -1.5, 0, 1.5; a person responds
>'3'. Can we know that person's measure just using a pocket calculator or
>paper and pencil? How about if the response is '1' or '4'?

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