One more PS7 question. Has anyone figured out how to get WhatIf to work for Section 3? I followed the instructions in various sites on the web and put this in R install.packages ("WhatIf", dependencies = TRUE) install.packages("lpSolve") It seems to load both packages, but when I try a command like whatif.result <- whatif (data= bioChem1, cfact=bioChem2) summary (whatif.result) It says it doesn?t recognize a function called whatif even though that seems to be how one is supposed to call this function. Any luck? What else do I have to do to load whatif. Many thanks. Best. Tom _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l