At 01:18 PM 3/31/98 -0600, Patrick Larsen wrote: The large standard deviation leads me to believe >there are variables other than just a design flaw. These variables may or >may not include coolant type, water type, flush intervals, driving style, >climate, stored in winter or not, ever overheated...I'm sure there are many >more but you get my point. > >Note: I am neither a statistician nor a waterboxer expert, these are the >opinions of a layperson :) > I AM a statistician, and my guess is that we can find out why these head fail with a high degree of certainty. There is a large enough N (number of cases) to make a statistically valid test possible. If anyone is serious about this, here are the obvious variables. If you can think of any others, let me know (reply to the list so everyone can see.) If you think I've listed some that are not important, say so. Once we've agreed on the important variables, I'll structure a survey form and owners can answer it and someone (not me) can collect and collate the data. I'll do a regression, and presto! we'll (maybe) have a better idea as to what goes wrong. VARIABLES Coolant type, pH of water, time between coolant changes, average length of trip, average speed during average trip (including stops), range of ambient temperature during driving year. More? Fewer? Ian Cameron U of Victoria Victoria, B.C. |
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