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- From: dr3u+@andrew.cmu.edu (Daniel Read)
- Newsgroups: sci.math.stat
- Subject: unweighted mean of means
- Message-ID: <8edG3vu00WBN868HYr@andrew.cmu.edu>
- Date: 2 Sep 92 12:15:55 GMT
- Article-I.D.: andrew.8edG3vu00WBN868HYr
- Organization: Engineering and Public Policy, Carnegie Mellon, Pittsburgh, PA
- Lines: 19
-
- I have some questionnaire data from which I wish to derive a "knowledge
- index" by taking the mean response to several of the questions.
- However, these are true-false questions and more of the questions are
- true than false. Moreover, many people are clearly disposed to choose
- True as a response rather than False. Of course, to the degree that
- they have this bias their knowledge index is inflated.
-
- I have solved this problem by taking the (unweighted) mean of the mean
- answer to false questions plus the mean answer to true questions.
-
- My question: can you think of anything wrong with doing this?
-
- BTW, I realize that taking the "mean" of ordinal responses is
- problematic, but I'm willing to weather this storm on my own -- which
- doesn't mean that I am uninterested in comments on that issue.
-
- Thanks in advance,
-
- daniel
-