I'm calculaing regression coefficients from three sets of angle data ([1 x 20] each) as predictor variables using the following code:
X = [ones(length(x1),1) x1' x2' x3']; B = X\devY';
However, the coefficients obtained are completely different depending on whether I input the angle data as degrees or radians. Therefore,
1) Why does the change in units result in a large difference in the coefficients based on the same data? 2) The different coefficients mean I need to justify the units I will be using to calculate the coeffcients. Any help here would be appreciated.
Any help would be appreciated.
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Are you able to supply a small dataset that shows the problem you are talking about? As you describe it, a uniform factor (unit change) should certainly not affect the coefficients of your model.