clan: Stata command for cluster-level analysis of a cluster-randomised trial now available on SSC

[Jennifer Thompson]

Dear all,

Thanks to Kit Baum, I am happy to announce a new Stata command, clan, is available in SSC. The command conducts a cluster-level analysis on data from a cluster-randomised trial. It can adjust for individual- and cluster-level covariates and account for stratification of the randomisation.

Installation

ssc install clan

Minimal example

. net get clan
 
. sysuse mkvtrial, clear
 .
. clan know i.agegp, arm(arm) cluster(community) effect(rr)
 
Cluster-level analysis
 
Number of clusters (total): 20                 Number of obs     =    4,100
Number of clusters (arm 0): 10                 Obs per cluster:
Number of clusters (arm 1): 10                               min =      169
                                                             avg =      205
                                                             max =      257
---------------------------------------------------------------------------
                    |   Estimate      df     P-val     [95% Conf. Interval]
--------------------+------------------------------------------------------
        Risk by arm |
                  0 |   .4501352
                  1 |   .6562291
--------------------+------------------------------------------------------
    Adj. risk ratio |   1.470462      18    0.0001     1.250648     1.72891
---------------------------------------------------------------------------

Suggestions for future updates and bug reporting would be appreciated.