R help - May 2017 - installing caret package

Hi all,

I'm using Rstudio 64 bit version3.2.5 and I faced a problem installing caret
package,the error is :

Loading required package: lattice
Loading required package: ggplot2
Error : object ?sigma? is not exported by 'namespace:stats'
Error: package or namespace load failed for ?caret?

how should I solve the problem with this sigma?!

Thanks for any help.
Elahe

> On May 12, 2017, at 1:21 PM, Elahe chalabi via R-help <r-help at
r-project.org> wrote:
> 
> Hi all,
> 
> I'm using Rstudio 64 bit version3.2.5
I'm guessing that means using R 3.2.5, at least if RStudio is keeping its
different os versions numering in sync. I'm on R studio 1.0.136 and I
don't think I'm that out of date. So the stats package is part of the
core load and to not have that function suggests that it was added and that you
are using code from a later package version. You could try dropping back to a
caret version from two years ago and see if you get better results ... or you
could exit RStudio, and update R.
> and I faced a problem installing caret package,the error is :
> 
> Loading required package: lattice
> Loading required package: ggplot2
> Error : object ?sigma? is not exported by 'namespace:stats'
> Error: package or namespace load failed for ?caret?
> 
> how should I solve the problem with this sigma?!
> 
> Thanks for any help.
> Elahe
> 
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David Winsemius
Alameda, CA, USA

On 12/05/2017 4:21 PM, Elahe chalabi via R-help wrote:
> Hi all,
>
> I'm using Rstudio 64 bit version3.2.5 and I faced a problem installing
caret package,the error is :
>
> Loading required package: lattice
> Loading required package: ggplot2
> Error : object ?sigma? is not exported by 'namespace:stats'
> Error: package or namespace load failed for ?caret?
The caret function was introduced in R 3.3.0.  You need to update R to 
be at least as new as that.

You might also let the maintainer of caret know about this; they should 
have "Depends:  R (>= 3.3.0)" or something similar to prevent this
kind
of error.  (But I don't see "sigma" being used in the current
source, so
this may have been addressed already, or the error message may be 
tricking me into looking in the wrong place.)

Duncan Murdoch