Data management: network setup

    study     d      n   trt  
        1     4     87     1  
        1    11     55     3  
        2     6     92     1  
        2     4     42     2  
        3    15    141     3  
        3    12    180     1  
        3     6     44     2  
        3    19    226     1  
        4    16    111     2  
        4    17    468     3  
        4    33   1260     1  
        4    33   1260     1  
        5   246   2871     1  
        5    11    172     2  
        5   113   1000     3  
        5    78   2446     1  
        6    54   1808     1  
        6    11    147     2  
        7     7     80     2  
        7     3     68     1  
        7     1     53     1  
        7     6     65     3  
        8     2     15     3  
        8     3     15     1  
        9    13    209     1  
        9    12    106     3  

. network setup d n , studyvar(study) trtvar(trt)
variables study trt do not uniquely identify the observations