Mike Wolfgang asks: > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Wolfgang > Sent: Wednesday, 23 August 2006 1:31 PM > To: R-help list > Subject: [R] glm inside one self-defined function > > Hi list, > > I've searched in R-help and found some related discussions but still could > not understand this type of error. My own function is pretty complex, so I > would not put it here, but the basic algorithm is like this: > myfun<-function(k){ > mydata<-...#by someway I create a data frame > mymodel<-glm(y~.,family=binomial(),data=mydata) > ...#some other stuff > }
I think you are leaving out something. Here is a test of what you claim gives a problem (R 2.3.1, Windows): > myfun <- function(n) { + z <- rnorm(n) + mydata <- data.frame(x = z, + y = rbinom(n, size = 1, prob = exp(z)/(1+exp(z)))) + fm <- glm(y ~ x, binomial, mydata) + fm + } > > myfun(100) Call: glm(formula = y ~ x, family = binomial, data = mydata) Coefficients: (Intercept) x 0.1587 1.0223 Degrees of Freedom: 99 Total (i.e. Null); 98 Residual Null Deviance: 137.6 Residual Deviance: 118.3 AIC: 122.3 Not even a murmur of complaint. (This also works in S-PLUS 7.0 but earlier versions of S-PLUS gave a problem rather like the one you note, curiously.) Look again at your code and see if the abstract version you give really matches what you did, may I suggest? > > as I execute this function, it gives error like this > Error in inherits(x, "data.frame") : object "mydata" not found > > So I guess glm here tries to find "mydata" in the parent environment. Why > doesn't it take "mydata" inside the function? How to let glm correctly > locate it? Is this (scope/environment) mentioned in R manual? Thanks, > > Mike ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.