I have run a 3rd order polynomial regression in R and have run the "summary" function, but I need to be able to replicate the "predict" function in Excel. I have my current working code below. Thank you for your help!
#Have access to this output: AICFit <- lm(R60 ~ poly(M20, 3) + poly(M40, 3), data = mydata) summary(AICFit) #do not have access to output: predict(AICFit,data.frame(M20=0.972375241,M40=0.989086129,interval ="prediction")
Basically, I don't have access to R when I have access to these numbers: 0.972375241,0.989086129.