Summary statistics for d2_1_c1_6 variable in snf_rollup2540_96_2005 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
   d2_1_c1_6 |          1          19           .         19         19

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