[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
https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fconsortium.uchicago.edu&data=02%7C01%7CNbezruczko%40msn.com%7C680d1c3d7eaa40723d8e08d53a5dbc53%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636479096617427095&sdata=PNdB80iBTgvPJefbO4%2B0pUdiOiyoRDgLZR7%2F%2BGpA3AI%3D&reserved=0

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