na.exclude should give the same results as na.omit, which is the default na.action. Is the number of complete cases the same in these two regressions?
On 26/07/07, Vaibhav Gathibandhe <[EMAIL PROTECTED]> wrote: > Hi all, > > Can you please tell me what is the problem here. > > My regression eq is y = B0 + B1X1 +B2X2 +e > And i am interested in coefficient B1 > > I am doing regression with two cases: > > 1) reg<-lm(y ~ X1 + X2, sam) where sam is the data > > 2) reg<-lm(y ~ X1 + X2, sam, na.action= na.exclude) . I have missing values > in X1 > > > but the values of coefficient is not consistent in two cases. > > Actually B1 in case one sould be smaller than B1 in case 2. But sometimes it > comes greater. > > I can't figure it out. Is there some problem with *na.action ? *My sample > size is 100 > > > *Regards,* > *Vaibhav* > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- ================================= David Barron Said Business School University of Oxford Park End Street Oxford OX1 1HP ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.