Max,
Thank you for the assistance. That was it. My dependent variable was just
using 1 and 0 as levels, I changed them to "yes", "no":
levels(trainset$outcome) <- list(no="0", yes="1")
and I no longer get the warning.
Brian
On Nov 29, 2012, at 10:29 PM, Max Kuhn <mxk...@gmail.com> wrote:
> Your output has:
>
> "At least one of the class levels are not valid R variables names; This may
> cause errors if class probabilities are generated because the variables names
> will be converted to: X0, X1"
>
> Try changing the factor levels to avoid leading numbers and try again.
>
> Max
>
>
>
>
> On Thu, Nov 29, 2012 at 10:18 PM, Brian Feeny <bfe...@mac.com> wrote:
>
>
> Yes I am still getting this error, here is my sessionInfo:
>
> > sessionInfo()
> R version 2.15.2 (2012-10-26)
> Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
>
> locale:
> [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
>
> attached base packages:
> [1] stats graphics grDevices utils datasets methods base
>
> other attached packages:
> [1] e1071_1.6-1 class_7.3-5 kernlab_0.9-14 caret_5.15-045
> foreach_1.4.0 cluster_1.14.3
> [7] reshape_0.8.4 plyr_1.7.1 lattice_0.20-10
>
> loaded via a namespace (and not attached):
> [1] codetools_0.2-8 compiler_2.15.2 grid_2.15.2 iterators_1.0.6
> tools_2.15.2
>
>
> Is there an example that shows a classProbs example, I could try to run it to
> replicate and see if it works on my system.
>
> Brian
>
> On Nov 29, 2012, at 10:10 PM, Max Kuhn <mxk...@gmail.com> wrote:
>
>> You didn't provide the results of sessionInfo().
>>
>> Upgrade to the version just released on cran and see if you still have the
>> issue.
>>
>> Max
>>
>>
>> On Thu, Nov 29, 2012 at 6:55 PM, Brian Feeny <bfe...@mac.com> wrote:
>> I have never been able to get class probabilities to work and I am
>> relatively new to using these tools, and I am looking for some insight as to
>> what may be wrong.
>>
>> I am using caret with kernlab/ksvm. I will simplify my problem to a basic
>> data set which produces the same problem. I have read the caret vignettes
>> as well as documentation for ?train. I appreciate any direction you can
>> give. I realize this is a very small dataset, the actual data is much
>> larger, I am just using 10 rows as an example:
>>
>> trainset <- data.frame(
>> outcome=factor(c("0","1","0","1","0","1","1","1","1","0")),
>> age=c(10, 23, 5, 28, 81, 48, 82, 23, 11, 9),
>> amount=c(10.11, 22.23, 494.2, 2.0, 29.2, 39.2, 39.2, 39.0, 11.1, 12.2)
>> )
>>
>> > str(trainset)
>> 'data.frame': 7 obs. of 3 variables:
>> $ outcome: Factor w/ 2 levels "0","1": 2 1 2 2 2 2 1
>> $ age : num 23 5 28 48 82 11 9
>> $ amount : num 22.2 494.2 2 39.2 39.2 ...
>>
>> > colSums(is.na(trainset))
>> outcome age amount
>> 0 0 0
>>
>>
>> ## SAMPLING AND FORMULA
>> dataset <- trainset
>> index <- 1:nrow(dataset)
>> testindex <- sample(index, trunc(length(index)*30/100))
>> trainset <- dataset[-testindex,]
>> testset <- dataset[testindex,-1]
>>
>>
>> ## TUNE caret / kernlab
>> set.seed(1)
>> MyTrainControl=trainControl(
>> method = "repeatedcv",
>> number=10,
>> repeats=5,
>> returnResamp = "all",
>> classProbs = TRUE
>> )
>>
>>
>> ## MODEL
>> rbfSVM <- train(outcome~., data = trainset,
>> method="svmRadial",
>> preProc = c("scale"),
>> tuneLength = 10,
>> trControl=MyTrainControl,
>> fit = FALSE
>> )
>>
>> There were 50 or more warnings (use warnings() to see the first 50)
>> > warnings()
>> Warning messages:
>> 1: In train.default(x, y, weights = w, ...) :
>> At least one of the class levels are not valid R variables names; This may
>> cause errors if class probabilities are generated because the variables
>> names will be converted to: X0, X1
>> 2: In caret:::predictionFunction(method = method, modelFit = mod$fit, ... :
>> kernlab class prediction calculations failed; returning NAs
>>
>> ______________________________________________
>> R-help@r-project.org 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.
>>
>>
>>
>> --
>>
>> Max
>
>
>
>
> --
>
> Max
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org 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.
