[Rasch] Fwd: Reliability, separation and strata

Fabio La Porta fabiolaporta at mail.com
Wed Mar 1 23:12:01 AEDT 2017


Considering that Ben's method makes the calculation of reliability
indipendent from the sample distribution, I think that it is much closer to
the Rasch philosophy than the typical  methods for  calculating reliability
employed by Rasch softwares, all of which assume a normally distributed

 I wonder why it's being used so little.

Definitely, I will use only this from now on.

Thank you very much.

Il giorno mer 1 mar 2017 alle 11:14 Mike Linacre <mike at winsteps.com> ha

> Fabio:
> Ben Wright's method does not use the sample of persons in its computation.
> The distribution of the sample of persons is irrelevant to
> his method.
> Mike L.
> On 3/1/2017 7:35 PM, Fabio La Porta wrote:
> > Just the last question: the Ben Wright's method can work also on a
> > distribution of persons approaching normality?
> >
> > I am asking this because I like very much the possibility to define
> > graphically the ranges of the statistically different levels of
> > performance along the measurement continuum.
> >
> > On the other hand, I have always find it difficult to draw strata on
> > the measurement continuum, as they have, almost always, decimal
> > values, making the whole process rather inaccurate.
> >
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