[Rasch] Misfitting persons

Nikolaus Bezruczko NBezruczko at msn.com
Mon Dec 4 03:05:24 AEDT 2017

I strongly agree with Stuart's suggestion below "to avoid negatively worded items whenever possible".  Negative and positive items are not the same and calibrating them together creates lots of avoidable confusion.

From: Rasch <rasch-bounces at acer.edu.au> on behalf of Stuart Luppescu <lupp at uchicago.edu>
Sent: Sunday, December 3, 2017 8:52 AM
To: rasch at acer.edu.au
Subject: Re: [Rasch] Misfitting persons

On Sun, 2017-12-03 at 21:02 +1100, Nicholas Reynolds wrote:
> ·         The scale has four reverse worded items, all of which are
> misfitting

This is a very common phenomenon. There are two principal causes:
1) People do not carefully read the items and do not notice the
negative valence, and
2) The reversed scale does not have the same threshold values as the
non-reversed scale. That is, for example, "agree reversed" does not
have the same meaning as "disagree".

I have found that putting the reversed items in their own response
group somewhat mitigates problem 2). It does nothing for 1), which is
why I try to avoid negatively worded items whenever possible.

Stuart Luppescu
Chief Psychometrician (ret.)
UChicago Consortium on School Research

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