On May 18, 2012, at 1:44 PM, Robbie Edwards wrote:
Hi all,
I'm trying to model some data where the y is defined by
y = summation[1 to 50] B1 * x + B2 * x^2 + B3 * x^3
Hopefully that reads clearly for email.
cumsum( rowSums( cbind(B1 * x, B2 * x^2, B3 * x^3)))
Anyway, if it wasn't for the summation, I know I would do it like this
lm(y ~ x + x2 + x3)
Where x2 and x3 are x^2 and x^3.
However, since each value of x is related to the previous values of
x, I
don't know how to do this. Any help is greatly appreciated.
David Winsemius, MD
West Hartford, CT
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