| Date: | Fri, 12 Nov 2004 15:00:33 +0100 |
| Reply-To: | Henrik Lolle <lolle@socsci.auc.dk> |
| Sender: | "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU> |
| From: | Henrik Lolle <lolle@socsci.auc.dk> |
| Subject: | Re: Negatively worded questions and Reliability |
|
| In-Reply-To: | <4194BC74.1010908@verizon.net> |
| Content-Type: | text/plain; charset="us-ascii"; format=flowed |
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I agree. And if I understand your situation right, Ola, then you must range
the items the same way as if you are going to calculate a simple scale of
the items. In factor analysis this is not nessesary (here you just know
then what negative loadings means), but in reliability analysis it is a
must. Here the items are summed into a scale, and if some items is upside
down this will give no meaning.
Best,
Henrik
At 14:36 12-11-2004, Art Kendall wrote:
>In an effort to reduce response bias it is customary to word half the
>items are worded so items with high values on the response scale
>indicate one end of the underlying construct, and half indicate the
>other end of the underlying construct.
>
>When you reflect the scores on the item you cite, it sounds like the
>underlying construct would be something like teacher confidence.
>
>When a response key change results in a higher internal consistency
>result that means it is more likely the correct key.
>
>Look at the inter-item correlation in the first analysis. There are
>likely to be sizable negative correlations.. Also take a look at the
>corrected item total and squared multiple correlations associated with
>each item. Large inconsistencies when comparing these two columns are
>an indicator that items are incorrectly keyed.
>
>Hope this helps.
>
>Art
>Art@DrKendall.org
>Social Research Consultants
>University Park, MD USA
>(301) 864-5570
>
>
>
>Ola S. Rostant wrote:
>
>>Dear List,
>>
>>I have a Likert scale with some negatively worded questions such as "I
>>am afraid I may be a failure as a teacher" (1 = strongly disagree, 2 =
>>disagree, 3 = agree, 4 = strongly agree).
>>
>>A colleague of mine suggested I reverse code questions like these. Does
>>anyone have an opinion on whether this is a plausible thing to do?
>>
>>I ran a reliability analysis on the entire survey and the alpha was .53,
>>when I reverse coded the negatively worded questions, the reliability
>>shot up to .89.
>>
>>All opinions and advice are welcome.
>>
>>Ola
>>
>>
>>
***********************************************************
Henrik Lolle
Associate Professor
Department of Economics, Politics and Public Administration
Aalborg University
Fibigerstraede 1
DK 9220 Aalborg East
http://www.socsci.auc.dk/institut2/dansk/empl/lolle.htm
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