Hi Adrienne,

I'm not familiar with your interface, but it sounds like R thinks the
package "mvtnorm" is not installed. You can see the packages you've
installed with:

row.names(installed.packages())

Is "mvtnorm" in the output of that command? You could test with the command,

"mvtnorm" %in% row.names(installed.packages())

If the result of the above command is FALSE, you can install it with:

install.packages("mvtnorm")

Best,
Ethan

On Fri, Jun 10, 2011 at 12:00 PM, Adrienne Keller <
adrienne.keller@umontana.edu> wrote:

> I am having problem loading packages in the newest version of R (2.13.0) on
> my Mac. I have tried to install various packages (e.g. lawstat, Rcmdr, car)
> and load them using the Package Installer and Package Manager menu options
> but I get the follow error:
>
> > library(lawstat)
> Loading required package: mvtnorm
> Error: package 'mvtnorm' could not be loaded
> In addition: Warning message:
> In library(pkg, character.only = TRUE, logical.return = TRUE, lib.loc =
> lib.loc) :
>  there is no package called 'mvtnorm'
>
> When I click on the box for loading lawstat in the Package Manager, it
> immediately reverts back to an unchecked box.
>
> I have tried to load mvtnorm and then load lawstat but I get the same
> error.
>
> Help?
>
> Thanks,
>
> Adrienne
>
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