Hi Yun Fan! Have you looked at "predict.lm"?
It can give you confidence and prediction intervals. Hope this helps! Sincerely, Erin Hodgess mailto: [EMAIL PROTECTED] ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
