I got also this problem and I solved it a couple of months ago. Unfortunatelly, I do not have access to the machine with my code before monday, so, I cannot give you the exact recipe... I am just recalling from my poor memory!
If I remember, the problem occured when MASS moved to use namespace, so, predict.lda was not visible externally any more, something that some ipred function assumed in the version I used at that time. The solution was to change the code of ipred to explicitly call the predict.lda function in MASS, that is, something like: MASS:::predict.lda give it a try. Since you use an old version of R (1.7.1), you may face a similar problem. I suppose the solution is to use latest versions of R, MASS and ipred. Best, Philippe Grosjean P.S.: Andrea and Thorsten: sorry for not having mentioned this when I got the problem. I was in a rush,... and then I forgot! But I suppose the latest version of ipred is OK now, isn't it? .......................................................<°}))><.... ) ) ) ) ) ( ( ( ( ( Prof. Philippe Grosjean \ ___ ) \/ECO\ ( Numerical Ecology of Aquatic Systems /\___/ ) Mons-Hainaut University, Pentagone / ___ /( 8, Av. du Champ de Mars, 7000 Mons, Belgium /NUM\/ ) \___/\ ( phone: + 32.65.37.34.97, fax: + 32.65.37.33.12 \ ) email: [EMAIL PROTECTED] ) ) ) ) ) SciViews project coordinator (http://www.sciviews.org) ( ( ( ( ( ................................................................... -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Martin Maechler Sent: Friday, 09 January, 2004 17:14 To: Stefan Böhringer Cc: R Help Subject: Re: [R] ipred and lda >>>>> "Stefan" == Stefan Böhringer <[EMAIL PROTECTED]> >>>>> on 09 Jan 2004 16:46:23 +0100 writes: Stefan> Dear all, can anybody help me with the program Stefan> below? The function predict.lda seems to be defined Stefan> but cannot be used by errortest. Stefan> The R version is 1.7.1 >> library("MASS"); >> library("ipred"); >> >> data(iris3); >> tr <- sample(1:50, 25); >> train <- rbind(iris3[tr,,1], iris3[tr,,2], iris3[tr,,3]); >> test <- rbind(iris3[-tr,,1], iris3[-tr,,2], iris3[-tr,,3]); >> cl <- factor(c(rep("s",25), rep("c",25), rep("v",25))); >> z <- lda(train, cl); >> predict(z, test)$class; >> >> data.frame(class=cl, train); >> flowers <- data.frame(class=cl, train); >> errorest(class ~ ., data=flowers, model=lda, estimator="cv", >> predict=predict.lda); Stefan> Error-Message is : Stefan> Error: Object "predict.lda" not found predict.lda is not exported from new versions of MASS since one should use predict( <lda-fit> , ...). i.e., I presume that errorest(class ~ ., data=flowers, model=lda, estimator="cv", predict=predict) will work. BTW: Please, remove the ";" at the end of lines. In S code, they are just plain ugly. Martin Maechler <[EMAIL PROTECTED]> http://stat.ethz.ch/~maechler/ Seminar fuer Statistik, ETH-Zentrum LEO C16 Leonhardstr. 27 ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND phone: x-41-1-632-3408 fax: ...-1228 <>< ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html