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big_reg
2010 Jun 17
3
trigonometric regression
Suppose I do a trigonometric regression
fit<-lm(y~ cf + sf)
where cf and sf are the cos and sine components.
b<-coef(fit)
I have the fitted sine component b[2] and the cos component b[3].
Doing summary(fit) gives me the p-values and SEs for b[2] and b[3].
But I want the amplitude of the fitted waveform
amp<-sqrt(b[2]^2+b[3]^2)
Can someone please tell me how to get the p-value for amp?