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Subject: Re: Comparision of Ply Depth verses Rating Performance - Math model

Author: Osorio Meirelles

Date: 12:23:05 08/09/02

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 There are several types of math models we can build that would have a very good
fit with rating as a variable to be predicted and ply as a predictor
variable.

 The main chalenge is finding out of what a perfect rating would be.

 Anyway, I found a model with an R-square above 99% with the data you provided
 and the model is:

   Rating = 3735 - 3641/sqrt(ply) where sqrt(ply) is the quare root of ply

 According to this formula, with ply = 26 we would have a rating of 3022
 ( which seems reasonable , not too high and not too low )

  Unfortunately, in this situation we have to extrapolate and the error
  due to extrapolation could be greater than we assume initially.








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