Here's another question:
What's kind of difference does glht tests?
In other words,
If I get 4 intercepts and 4 slopes for all levels of GROUP,then glht tests
for the difference of the 4 intercepts or 4 slopes,or something else?

Thanks.




2011/7/27 Lao Meng <laomeng.3@gmail.com>

> Yes.
> According to your suggestion,I modified my code.It works well.
>
> Thanks you very much.
>
>
> My best.
>
>
>
> 2011/7/26 Peter Ehlers <ehlers@ucalgary.ca>
>
>> 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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>>
>>
>

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