Can we use polynomial regression using logarithmically transformed data. I transformed both y and x1 and x2 variables by natural log. After this, I used polynomial regression to fit. when using poly(), fitting result is good when using other types of model, the results are not good. I wanna make sure if I can use polynomial regression on transformed data?
model form in R is:
mod <- lm(logy ~ poly(logx1 + logx2, 2, raw=TRUE)
Thanks in advance!