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- Posted-Date: Wed, 6 Jan 93 09:03:50 -0800
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- Date: Wed, 6 Jan 1993 09:03:50 -0800
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- From: Marken@COURIER4.AERO.ORG
- Subject: Testers/Testees
- Lines: 57
-
- [From Rick Marken (930106.0830)]
-
- Martin Taylor and Bill Powers are right on target about tests:
-
- Martin Taylor (930105.1800)says:
-
- >... it seems to me that the testers are justified in being
- >happy that (more people survive the cancer longer| more
- >students can read the instructions in a manual| more people are
- >happy using the isntrument), even if the differences are
- >measurable only statistically. It's a question of whose
- >control systems are you worrying about, the tester's or the
- >testees'.
-
- and Bill Powers (930105.2130) says:
-
- >Precisely. The insurance company cares earnestly about the
- >statistical effects of hazardous substances or conditions. The teacher cares
- >(or if certain policies are carried out, will come
- >to care) about turning out class after class that scores high, as
- >a population, on national tests. Mass statistics apply to masses.
-
- >The individual, however, is well-advised to avoid being part of
- >such mass systems, because the tradeoff is never in the
- >individual's favor.
-
- This is really what most social science is about -- producing
- average effects on groups. Psychology is really the science
- of groups; unfortunately, it thinks it is about individuals,
- and this is mainly self-deception. Now that I think of it, the
- only places PCT has been able to have ANY impact on
- conventional psychology is where this psychology is REALLY
- about individuals -- as in much of perceptual psychology,
- operant psychology and clinical psychology. PCT is
- a model of individuals -- so right off the bat, a hugh
- amount of psychological data, based on averaging over
- individuals (ie. mass data based on sample measurements)
- becomes irrelevant. Of course, it would not be irrelevant
- if there were almost no variance across individuals and/or
- if the reliabilities of the measurements were on the order of
- .99. So Martin's point is well taken -- high reliabilities are
- most important if you care about individuals (testees); you
- can be a lot more sloppy if you just care about getting
- mass data results that satisfy yourself (the tester) -- and
- so the question to the people who want to do the testing
- at my company is "are you doing this for the individuals
- in the company, or for yourselves"? I'm sure that they im-
- agine that they are doing it for the former; my job will be
- to gently point out that they are really doing it for the
- latter.
-
- By the way Martin, thanks for the wonderful "loose
- canon [sic]" article from your paper; I am having it framed.
-
- Best
-
- Rick
-