Summary statistics for numdiffphyspdeceol variable in daphrr2008 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
numdiffphy~l |        307     8.77741    1.854325   5.198128   14.30002

by Jean Roth , jroth@nber.org , 14 Mar 2018