Hi Irene, The result depends on the joint distribution of x1,x2,y1,y2. The mean (or the variance) not always exist (if, for example, all of them are independent and normally distributed). One possibility to estimate mean and variance is to use simulation (once you verify that they exist!!!).
Regards, Moshe. --- Irene Mantzouni <[EMAIL PROTECTED]> wrote: > Hi all! > > > > I try to estimate a statistic of the form: > (x1-x2)/(y1-y2), where > x1,x2,y1,y2 represent variable means, so each has an > estimate and > standard error associated with it. > > How is it possible to estimate the mean and the > variance of this ratio? > > > > Thank you! > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org 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. > ______________________________________________ R-help@r-project.org 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.
