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  1. Comments: Gated by NETNEWS@AUVM.AMERICAN.EDU
  2. Path: sparky!uunet!zaphod.mps.ohio-state.edu!darwin.sura.net!paladin.american.edu!auvm!IRLEARN.UCD.IE!RCONROY
  3. Message-ID: <STAT-L%92091004411572@VM1.MCGILL.CA>
  4. Newsgroups: bit.listserv.stat-l
  5. Date:         Thu, 10 Sep 1992 09:32:49 GMT
  6. Sender:       "STATISTICAL CONSULTING" <STAT-L@MCGILL1.BITNET>
  7. From:         Ronan M Conroy <RCONROY@IRLEARN.UCD.IE>
  8. Subject:      Blue + sad = ?
  9. Lines: 11
  10.  
  11. Francis Dane maintains that adding "I'm blue" to "I'm sad" will
  12. be valid if the two are correlated. But what if all those who say
  13. they're blue are the self-same people who say they're sad? This
  14. means that one symptom now counts for two points on the scale.
  15. Clearly this violates one rule of measurement, viz: that all objects
  16. with the different labels are different things. Adding together
  17. items may produce pseudo-variation if the items are of the
  18. same 'degree of difficulty' - very concordant, in a word (two words,
  19. actually - well, ten, if you count the digression).
  20.  
  21. ronan
  22.