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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