Summary statistics for actvty_stf_othr_cntrct_cnt variable in pos2009 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
actvty_stf.. |    122,973    .0039692    .1784244          0         32

by Jean Roth , jroth@nber.org , 17 May 2017