I am wondering how to fit a sinusoidal wave (approximation). I would like to fit it in the form: $y = A\sin(Bx + C) + D$ where $A,\,B,\,C$ and $D$ are constants. The only constants I really care about is A and B so that I can get the amplitude and time period..
I think I should clarify.. The data that I will be fitting will likely be noisy, so I was thinking that sine fit might give me a more accurate reading for the amplitude than just taking the max and min values from the raw data..