Summary statistics for d2_1_c1_4 variable in snf_rollup2540_96_1997 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
   d2_1_c1_4 |          4     4042327     2694871         20    5389763

by Jean Roth , jroth@nber.org , 17 Feb 2018