R help - May 2011 - [caret package] [trainControl] supplying predefined partitions to train with cross validation

Hi all,

I run R 2.11.1 under ubuntu 10.10 and caret version 2.88.

I use the caret package to compare different models on a dataset. In
order to compare their different performances I would like to use the
same data partitions for every models. I understand that using a LGOCV
or a boot type re-sampling method along with the "index" argument of
the trainControl function, one is able to supply a training partition
to the train function.

However, I would like to apply a 10-fold cross validation to validate
the models and I did not find any way to supply some predefined
partition (created with createFolds) in this setting. Any help ?

Thank you and great package by the way !

Fabon Dzogang.

Hi,

I did the similar experiment with my data. may be following code will give
you some idea. It might not be the best solution but for me it worked.
please do share if you get other idea.

Thank you

#### CODE###

library(dismo)


set.seed(111)


dd<-read.delim("yourfile.csv",sep=",",header=T)


# To keep a check on error

options(error=utils::recover)


# dd- data to be split for 10 Fold CV, this will split complete data into 10
fold

number<-kfold(dd, k=10)


case 1: if k ==1

x<-NULL;


#retrieve all the index (from your data) for 1st fold in x, such that you
can use it as a test set and remaining can be used as train set for
#1stiteration.

x<-which(number==k)

On Thu, May 5, 2011 at 11:43 PM, Fabon Dzogang
<fabon.dzogang@lip6.fr>wrote:
> Hi all,
>
> I run R 2.11.1 under ubuntu 10.10 and caret version 2.88.
>
> I use the caret package to compare different models on a dataset. In
> order to compare their different performances I would like to use the
> same data partitions for every models. I understand that using a LGOCV
> or a boot type re-sampling method along with the "index" argument
of
> the trainControl function, one is able to supply a training partition
> to the train function.
>
> However, I would like to apply a 10-fold cross validation to validate
> the models and I did not find any way to supply some predefined
> partition (created with createFolds) in this setting. Any help ?
>
> Thank you and great package by the way !
>
> Fabon Dzogang.
>
> ______________________________________________
> 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.
>
	[[alternative HTML version deleted]]