Summary statistics for psych_unit_efctv_dt variable in pos2018 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
psych_u~v_dt |      2,375    2.00e+07    104646.2   1.98e+07   2.02e+07

by Jean Roth , jroth@nber.org , 15 Feb 2019