Summary statistics for numdiffphyspdeceol variable in daphosp2010 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
numdiffphy~l |      2,555    10.80035    2.714681   4.305664   19.67968

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