Summary statistics for numdiffphyspdeceol variable in daphrr2014 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
numdiffphy~l |        307    9.795257    1.941663   6.063058   15.46237

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