To follow Dieter's comment,
You can in fact fit a data to a sine in Excel using LINEST. I've done
it. I don't recommend it :-) .
What I did was create columns containing sin(x) and cos(x) , roughly
speaking, and fit using
LINEST([y=values],{sines, cosines},...)
Ya need the cosines or something similar to get rid of phase ambiguity.
But using either FFTs or glm() should do fine.
And stay away from Excel! :-(
Carl
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