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- From: jnielsen@magnus.acs.ohio-state.edu (John F Nielsen)
- Newsgroups: rec.autos
- Subject: Re: yet another consumer reports article (Re: Before Buying Japanese.)
- Message-ID: <1993Jan25.174221.11394@magnus.acs.ohio-state.edu>
- Date: 25 Jan 93 17:42:21 GMT
- References: <1993Jan21.194635.7009@kocrsv01.delcoelect.com> <1993Jan22.142044.20423@magnus.acs.ohio-state.edu> <1993Jan22.181330.2179@kocrsv01.delcoelect.com>
- Sender: news@magnus.acs.ohio-state.edu
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- Organization: The Ohio State University
- Lines: 40
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-
- In article <1993Jan22.181330.2179@kocrsv01.delcoelect.com> c23st@kocrsv01.delcoelect.com (Spiros Triantafyllopoulos) writes:
- >In article <1993Jan22.142044.20423@magnus.acs.ohio-state.edu> jnielsen@magnus.acs.ohio-state.edu (John F Nielsen) writes:
- >>>Unless CR can prove that they have used a sample population
- >>>representative of the actual population of course...
- >>
- >>Why is that necessary for what they are trying to show. Unless the
- >>people answering the questionaires are morons or like to lie, the
- >>data is useful, it is not that hard to know when you got a repair.
- >
- >Because, very simply, it is not correct. In order for the statistics
- >to be correct they would have to make sure that several things happen:
-
- Their pur[po
- >
- >a. questionnaires are mailed to people in proportion to car ownership
- > (or market share)
- >b. response rates are similar to mailing rates
- >c. response rates are accurate as far as problem reporting goes
- >d. statistical methods are followed properly
-
-
- What I am contending is that for what they are trying to show,
- all of this is not necessary.
-
- IF you have 10,000 people responding about problems with their Ford
- Ranger and 50,000 about problems with their Ford Taurus, patterns
- will show up. And, both with have groups of people who respond
- because they love or hate their machine.
-
- >In my case, a couple of things. One was that the lawnmower in question
- >was WAY too HEAVY after grass clippings were collected; its engine
-
- Which mower was this?
-
- john
- --
- John Nielsen MAGNUS Consultant ______ ______ __ __
- jnielsen@magnus.acs.ohio-state.edu /\ __ \ /\ ___\ /\ \/\ \
- \ \ \/\ \\ \___ \\ \ \_\ \
- Back off man, I'm a Scientist! \ \_____\\/\_____\\ \_____\
-