Summary statistics for mdcl_scl_workr_vlntr_cnt variable in pos2013 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
mdcl_~tr_cnt |      5,238    .0654448    .7020182          0         28

by Jean Roth , jroth@nber.org , 26 Jan 2016