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Full_Name: Lyle W. Konigsberg Version: 1.5.1 OS: Windows Submission from: (NULL) (160.36.64.99) I apparently found an error in how "deriv" puts a derivative to the screen (though the internal representation is correct). Here's what I was doing for a class example: > lnlk<-expression(15*log(p)+11*log(1-p)) > p<-15/26 > D(D(lnlk,"p"),"p") -15 *

...iple of replacement length Ultimately I need to be able to integrate this function, which isn't going to happen (correctly) if I've messed-up writing the function. Thanks for any advice on this. Regards, Lyle W. Konigsberg Professor of Anthropology University of Tennessee Knoxville, TN LyleK at utk.edu