Summary statistics for efctv_dt variable in hcpcs2015 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
    efctv_dt |      6,119    2.01e+07    66735.35   1.98e+07   2.02e+07

by Jean Roth , jroth@nber.org , 25 Oct 2016