Summary statistics for PSYCH_UNIT_EFCTV_DT variable in pos2011 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
PSYCH_U~V_DT |      2,284    12436.93    3040.746       2373      19267

by Jean Roth , jroth@nber.org , 19 Apr 2019