Summary statistics for mdcl_scl_workr_vlntr_cnt variable in pos2010 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
mdcl_~tr_cnt |    125,821    .0025487     .140026          0         28

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