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Re: st: Mokken scaling procedure - output


From   "JVerkuilen (Gmail)" <jvverkuilen@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Mokken scaling procedure - output
Date   Tue, 12 Feb 2013 10:39:16 -0500

On Tue, Feb 12, 2013 at 10:09 AM, Laura Maria Schwirz <schwirzl@tcd.ie> wrote:
> Dear Statalist Users
>
> I have a set of variables that look at party leader traits. For
> example, on a scale from 0 to 5 how well does trait X describe leader
> Y? I would like to examine whether these traits form a scale or not.
> Is Mokken scaling procedure the right approach for this and if so,
> what does the actual output tell me? See below for an example where
> traits are knows how to manage economy, likeable, energetic,
> trustworthy.

There's no below to see. ;)

I'm the resident psychometrician. In general I find that Mokken
scaling is a good approach for many practical scale analyses, but I
recommend that you read at least a few articles on it. You also should
do a thorough job of missing data analysis and descriptive statistics,
including correlations.

Here are citations to the two articles I assign in my IRT course on
nonparametric IRT:

Meijer, R. R. & Baneke, J. J. (2004). Analyzing psychopathology items:
a case for nonparametric item response modeling. Psychological
Methods, 9, 354-368.
van Schuur, W. (2003). Mokken scaling: between the Guttman scale and
parametric item response theory. Political Analysis, 11, 139-163.
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