Summary statistics for spch_pthlgst_audlgst_cnt variable in pos2009 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
sp~dlgst_cnt |    122,973    .2173456    12.35631          0       4000

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