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- From: c23st@kocrsv01.delcoelect.com (Spiros Triantafyllopoulos)
- Newsgroups: rec.autos
- Subject: yet another consumer reports article (Re: Before Buying Japanese.)
- Message-ID: <1993Jan22.181330.2179@kocrsv01.delcoelect.com>
- Date: 22 Jan 93 18:13:30 GMT
- References: <C17oxK.FKF@ccu.umanitoba.ca> <1993Jan21.194635.7009@kocrsv01.delcoelect.com> <1993Jan22.142044.20423@magnus.acs.ohio-state.edu>
- Sender: news@kocrsv01.delcoelect.com (Usenet News Account)
- Distribution: na
- Organization: Delco Electronics Corp.
- Lines: 68
-
- 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:
-
- 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
-
- a. is not the case (I would bet that CR readers do not represent
- a balanced car ownership group, i.e. 70% domestic, 30% import)
- b. is not the case if a. is not the case and at either case :-)
- I don't think they bother to check
- c. is not the case due to 'expectation management' and many other
- factors (i.e. consumers understanding what is wrong with their
- cars, trusting dealers to tell them and fix what is wrong, etc)
- d. I would not know. They'd have to adjust the data for things like
- driving conditions, mileage, proper/improper servicing, etc)
-
- The only true source for a,b,c is manufacturers data for warranty
- claims for repairs (initially) and service records (after
- warranty/uncovered). Of course noone will provide such data.
-
- Again, I'm not a statistician (married to one though) but have taken
- enough classes in statistics to see some of the obvious flaws; entire
- CHAPTERS in statistics texts are devoted to incorrectly used stat
- methods.
-
- >>CR is great for getting you to THINK about features, but I have had
- >>serious questions about their credibility ever since I bought a
- >>lawnmower based on what they said... Just like in cars, they were
- >>quick to point out flaws or potential flaws in SOME brands but MAJOR
- >>flaws were sometimes ignored in SOME brands.
- >
- >So, what did they mess up on?
-
- 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
- was 4.5 hp instead of 5; oil changes are quite messy due to drain plug
- placement; owner's manual was written by people whose native tongue was
- CLEARLY not English, making it impossible to understand how to do even
- simple procedures); transmission with only two gears (instead of more) which
- are not spaced properly, i.e. low is too slow, even fast is not fast enough;
- lack of manouevrability (jockey-ing)....
-
- Most of these things were pointed out for OTHER mowers, but not for the
- knight-in-shiny-armor they rated tops.
-
- Whatever they pointed out as a plus was a plus, so I'm sure they tested
- the mower; but in their trivia-pick mode they should have picked the wrongs,
- too.
-
- Spiros
-
-
-
- --
- Spiros Triantafyllopoulos c23st@kocrsv01.delcoelect.com
- Software Technology, Delco Electronics (317) 451-0815
- GM Hughes Electronics, Kokomo, IN 46904 [A Different Kind of Disclaimer]
-