[Rasch] Negative pt-bis and fit of 1.0? How can this be?

Mark Moulton markhmoulton at gmail.com
Wed Mar 7 10:05:51 EST 2012

Cool!  See you in Vancouver.

On Tue, Mar 6, 2012 at 1:53 PM, Stuart Luppescu <slu at ccsr.uchicago.edu>wrote:

> On Tue, 2012-03-06 at 15:36 -0600, Stuart Luppescu wrote:
> > Are you saying that if I just generated 1's and 0's randomly and tried
> > to calibrate them they would all fit? Hmmm. I'm going to have to try
> > that....
> Very interesting, indeed! Of course, you get 0 reliability and
> point-biserials near 0, but all the fit statistics are very close to
> 1.0! Mark Moulton gets a beer next time I see him for providing the
> instructional moment of the day.
> --
> Stuart Luppescu -=- slu .at. ccsr.uchicago.edu
> University of Chicago -=- CCSR
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