[R-sig-ME] How to extract num. of observations and groups used in a mixed model using gee package

[david oseguera montiel]

I meant the grouping factor in the model indicated by id. From gee 
documentation 'id = a vector which identifies the clusters..'. So in the 
warpbreaks data set, id = wool has 54 obs, in two clusters (groups).
library(gee)
library(Hmisc)
 > describe(warpbreaks$wool)
warpbreaks$wool
       n missing  unique
      54       0       2

A (27, 50%), B (27, 50%)



On 23/04/2012 22:57, David Winsemius wrote:
>
> On Apr 23, 2012, at 11:25 PM, david oseguera montiel wrote:
>
>> David,
>> Thank you very much. Number of observations solved, but I am still 
>> missing how to find out the number of groups used. In the warpbreaks 
>> data set these are 2. Any ideas. Thank you.
>>
> I must be unclear what you mean by "number of groups".