Hi, Can someone help me on the following problem? I have nearly 103,000 records with 22 variables (some are factors). When I ran a stepwise glm on the data set, the R program stops with an error message "Error: cannot allocate vector of size 171.3Mb." I have an R 2.12.0 on my PC (Windows XP) with a maximum 4Gb RAM. Thanks Siddeek