Summary statistics for mfr_dt variable in demo2009q1 dataset :

    Variable |       Obs        Mean    Std. Dev.       Min        Max
-------------+--------------------------------------------------------
      mfr_dt |    102956    2.01e+07    9219.706   1.99e+07   2.01e+07

by Jean Roth , jroth@nber.org , 18 Dec 2015