Dear All,
I have created a time trend by doing x<-1:93 because I have a time series
with 93 data points. Next I did :-
y = lm(series ~ poly(x,4))$residuals
to detrend series.
I choose this 4 as the order of my polynomial using cross validation/
checking the absence of trend in the residuals so I think I have not
overfit this series.
I wish to document the formula of poly(x,4). I am not able to find it in
?poly
Can someone please tell me what the formula for the orthogonal polynomial
used by R is ?
Thank you,
Ashim
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