On 08/23/2011 08:39 PM, Iasonas Lamprianou wrote:
Dear colleagues,
I would like to run a cluster analysis on a number of variables. They are Likert
Scale (0 to 10), but they also have a "Don't know' option at the end of the
scale. Apparently, with the 'Don't Know' option in place, they cannot be considered
to be linear or ordinal. How can these variables be analysed using R? One option
would be to use poLC and treat them as categorical variables to classify the
respondents into clusters (latent categorical variable). But is there a way to treat
them as partly ordinal/conitinuous and partly categorical?
Thank you
Jason
Hi Jason,
The way I have treated this sort of response measure is to create two
variables, as two questions are being asked. One is:
"Do you have an opinion on this statement?"
and the other is:
"How much do you agree or disagree with this statement?"
(if the item really is a Likert scale). A "No" on the first question
automatically implies a missing value on the second.
Oh, and I usually tell the person who has written the questionnaire to
limit each item to one question.
Jim
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