[R] a question about glht function

[Peter Ehlers]

On 2011-07-26 00:16, Lao Meng wrote:
> Hi all:
> There's a question about glht function.
>
> My data:data_ori,which inclue CD4, GROUP,time.
>
>
> f_GROUP<-factor(data_ori$GROUP)
>
> f_GROUP is a factor of 3 levels(0,1,2,3)
>
>
> result<- lme(sqrt(CD4) ~ f_GROUP*time ,random = ~time|ID,data=data_ori)
>
> glht(result, linfct = mcp(f_GROUP="Tukey") )
> Error in `[.data.frame`(mf, nhypo[checknm]) : undefined columns selected
>
>
> I can't find out the reason for Error.

I think glht() is looking for f_GROUP in data_ori.
You have defined f_GROUP in your global environment but
have not added it to your dataframe.

Peter Ehlers

>
>
> Any help from you are welcome.
>
>
> Many thanks!
>
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