Summary statistics for actvty_stf_othr_cntrct_cnt variable in pos2004 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
actvty_stf.. |    108,700    .0043111    .1768785          0         32

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