[R] what is the difference between using function predict() and coef() in prediction

Petr PIKAL petr.pikal at precheza.cz
Fri Dec 9 14:12:20 CET 2011


Did you find any difference? The results shall be same (with only rounding 
error). Can you show us some example where you get substantial difference?


> i do not know what is the difference between predict() and coef()
> i use the two function give me different result 
> zz = predict(xy.lm,list(T8=T8))
> ss = coef(xy.lm)[1]+(coef(xy.lm)[2])*T8
> where is t8 is the data used in prediction did not use in the fitting in
> training sample where every sample is 15 value
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