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- Newsgroups: sci.math.stat
- Path: sparky!uunet!boulder!ucsu!yertle.Colorado.EDU!mcclella
- From: mcclella@yertle.Colorado.EDU (Gary McClelland)
- Subject: Re: Levels of Measurement?
- Message-ID: <mcclella.724707215@yertle.Colorado.EDU>
- Sender: news@ucsu.Colorado.EDU (USENET News System)
- Nntp-Posting-Host: yertle.colorado.edu
- Organization: University of Colorado, Boulder
- References: <92351.201518U53076@uicvm.uic.edu>
- Date: Fri, 18 Dec 1992 19:33:35 GMT
- Lines: 26
-
- <U53076@uicvm.uic.edu> writes:
-
- > Let me first apologize for boring you with such a mundane question. Anyway
- >I am in a dispute about levels of measurement and the appropriate statistics to
- >use when dealing with data at the ordinal level. I'd like to compare performan
- >ce on a communication task across two different contexts. In both cases,
- >competence is measured on an ordinal scale, for simplicity's sake, 1, 2, 3. It
- >has been my practice in the past to compute a Pearson product-moment correlatio
- >n between the two tasks and to use the resulting r as an indication of the
- >degree to which performance is consistent across tasks. I recently was told
- >that this was an inappropriate test cause I was only at the ordinal level. But
- >my references (see esp. Glass & Hopkins, 1984; Heermann & Braskamp, 1970) say
- >that the whole levels of measurement question has ben blown out of proportion,
- >and that the sort of usage I describe is just fine. What do you think?
-
- I agree that the levels of measurement question has been blown
- out of proportion, but you can easily avoid the whole issue in
- your case. A Pearson product-moment correlation computed on
- ranks is also known as a Spearman-rho rank-order correlation. So
- just call your statistic a Spearman rho and everyone should be
- happy; you'll be happy because you don't have to recalculate
- anything.
-
- gary mcclelland
- univ of colorado
- mcclella@yertle.colorado.edu
-