Re: 'trend value' formula needed

From: Andy Smith <andy@xxxxxxxxxxxxxxxxxxxx>
Date: Fri, 05 Jan 2007 07:09:52 EST

What you need to do is to fit a plane to your 3 data points (or a least square fit if you have more data points).

Your model is C = aA + bB + k

- with three sets of (A,B,C) you have 3 simultaneous equations to solve for a,b and k; then you just use the formula above to read off C for a given A,B value.
.

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