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Topic: Help: Estimating r correlation
Replies: 2   Last Post: Jul 17, 1996 12:39 PM

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David Smith

Posts: 5
Registered: 12/11/04
Help: Estimating r correlation
Posted: Jul 17, 1996 12:04 AM
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Could someone help on this? Thanks.

I have a data set consisting of points (x,y,z) where x and y are
independent variables in an expt and z is the dependent variable. I want
to find the correlation between this data set and two models (equations)
each of which predicts a particular surface in the 3D space. Is there an
[easy] way of doing this?

I¹ve tried using various software packages but they have the annoying
habit of first varying the equation parameters so as to provide a least
squares fit. I just want to know the direct correlation between the
equations as given and the data set.

Also is it valid to compare the two correlations when one equation is
linear (x+y)/2 and the other is non-linear Sqrt[xy]?

Any help much appreciated.


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