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...ot;) I have attached the file which I import directly from the menu, named: excel250.csv. When I run the code it gives me the following error: Error in optim(c(5, 2, 2), ll) : function cannot be evaluated at initial parameters I would appreciate your help. Thank you. Konstantinos <nabble_a href="excel250.csv">excel250.csv -- View this message in context: http://r.789695.n4.nabble.com/Help-with-R-Fitting-an-inverse-Gamma-tp4644984.html Sent from the R help mailing list archive at Nabble.com.