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...missing data with the mean computed with the remaining part of data. Anyway, I think R can actually compute the mean even with the presence of missing data. Is it right? What can I do? Thank you very much for your attention and, I hope, your help. Best wishes Luciana Scalone Center of Pharmacoeconomics University of Milan [[alternative HTML version deleted]]

Hello, I'm tasked with putting together a cost effectiveness analysis on a proposed medical treatment. The "standard" suggested by someone is an expensive commercial package names "TreeAge Pro" which looks like its just a fancy GUI on top of a decision tree. However, we don't have it and it is expensive to buy. Questions for the group: 1) Are there any interesting