by(mydata, mydata$GROUPING, function(x) cor(x$x, x$y, use="pair"))
?by Krishna wrote: > Hi all > > Having searched the available documentation on R, I request for help > in sorting out the underlying problem. > > I have a huge dataset containing 2 variables x and y, which is a daily > price series. > > I would like to observe the quarterly correlations among these two > variables. Is there anyway where i can calculate cor.coeff by using a > grouping variable in R. > > thanks in advance for the help > > rgds > > snvk > > ______________________________________________ > 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 > -- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 452-1424 (M, W, F) fax: (917) 438-0894 ______________________________________________ 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