[Rasch] One partial-credit item or multiple dichotomous items?

Stuart Luppescu slu at ccsr.uchicago.edu
Tue Mar 3 09:33:38 EST 2015

On 03/02/2015 04:20 PM, Mike Linacre wrote:
> Thanks for the question, Stuart.
> If you think of your item as a 2-stage adaptive test:
> 1. Did you understand? 0/1
> 2. If yes, how much? 0/1
> Then the possibilities are
> 11
> 10
> 0(missing)
> But your item is really a rating scale, because the decision about
> whether to choose "Did not understand at all" is influenced by the next
> level up "Understood incompletely". If the next level up had been
> "Understood almost nothing", then there would have been fewer people
> choosing "Did not understand at all", perhaps no one, because presumably
> everyone understood enough to read the words in the item.
> OK?

Got it. Thanks, Mike, Rense, Eivind, and Andrew.

Stuart Luppescu

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