albinali wrote: > Hi, > I am trying to do a regression on a data set with a fixed intercept at > some number (75) other than zero, the problem is that the package I am using > can fix the intercept only at the origin. To overcome this problem I > subtracted from each y in the dataset 75 and performed the regression. Of > course the slope coefficient shouldnt change with the new dataset, I finally > added to the resulting regression equation 75. Is that valid?
Your math is valid. However, the logic behind fixing the intercept at 75 (or any other constant value) may or may not be valid. There have been many discussions in these newsgroups in the past on this issue, I suggest you do a search at Google and read what has been written on the issue of forcing the intercept to a specific value. -- Paige Miller Eastman Kodak Company [EMAIL PROTECTED] http://www.kodak.com "It's nothing until I call it!" -- Bill Klem, NL Umpire "When you get the choice to sit it out or dance, I hope you dance" -- Lee Ann Womack . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
