I received numerous requests to summarize responses to my original post
(attached at bottom).
>From John Maindonald:
"There's an insightful discussion of Scaling Responses in
Chapter 4 of Streiner & Norman: Health Measurement Scales
2 ed, Oxford, 1995."
>From Ed Malthouse:
"This is discussed in most marketing research text books, e.g., see
Churchill's book. There is a tradeoff between the two. The 7-point
scale provides more shades of grey, which can be important when you
are doing, e.g., factor analysis or cluster analysis, but is said to
be more difficult to administer during a phone survey."
And that is all.
Thanks to both John and Ed for their assistance, I have found both replies
helpful.
Best wishes,
Eric Gibson
Novartis Pharmaceuticals, Ph.D.
____________________________________________________________________________________
eric.gibson@pharma.Novartis.com on 01/26/2000 03:49:12 PM
To: s-news@wubios.wustl.edu
cc: (bcc: Eric Gibson/PH/Novartis)
Subject: [S] 5 point versus 7 point scales on questionnaires
Anyone out there have any journal article references using
5 point versus 7 point scales in questionnaires.
Example of a 5 point scale:
1=Excellent
2=Good
3=Fair
4=Poor
5=Worsening
Example of a 7 point scale:
1=Extremely bothered
2=Very bothered
3=Quite bothered
4=Somewhat bothered
5=Bothered a bit
6=Hardly bothered at all
7=Not bothered
I'm not the author of either scale.
Please respond to me directly, rather than to the whole list.
Best wishes,
Eric Gibson, PhD
Novartis Pharmaceuticals
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