NavList:

   

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Greg,

For this sort of problem a spreadsheet program becomes really very
handy even though the human eye can surprisingly well estimate such
(linear) regression lines. On your Mac the spreadsheet program seems
to be Works which I don't know. May be there is an other Mac-user on
NavList who can give you some hints on how such polynomial regressions
can be calculated with a few clicks. Or, as in the case of the
arc-tan-function, how to find the solution using the equivalent of
what "Solver" does in Excel.

Marcel

   

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