pic microcontroller discussion list wrote:
> I want my mpu to be able to create values for a linear regression
> equation from 4 values that are entered, example:
>
> When A = 6, B = 2.1
> When A = 30, B = 0
>

besides the other answers already given, the generic formula
for finding the slope given many samples is:

slope = ((n*SumXY) - (SumX*SumY)) / ((n*SumX^2) - (SumX)^2)

where n = number of samples, and "Sum" should be taken as "sigma".
For example, SumXY is the summation of all X*Y, and SumX^2 would be
the summation of all X^2. I've done this on an '877.

If you only have four values, definitely use one of the other
methods!

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