Hello all, Thanks for the help on setx() before. I think I am having a problem with passing arguments into a function. I want my function to have a line that says tt<- teh[,gg.r$treat==1] for various "treat"s. (this is for generating the ATT -- the columns of teh where the treatment was applied.) So my function is like at.func<- function(arg1, arg2, treat, arg4) { . . . tt<- teh[,gg.r$treat==1] . . . } When I do this for a particular value of treat outside of the function, ie, tt<- teh[,gg.r$phone==1] it works fine, but in passing the argument within the function it seems to not understand this. (tt is empty). Can anyone help me with this? Andy _______________________________________________ gov2001-l mailing list gov2001-l(a)lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l