Summary statistics for nadacc20160518 dataset :

by Jean Roth , jroth@nber.org , 10 Feb 2018

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
ndcdescrip~n |          0
         ndc |          0
oldnadacpe~t |     20,259    1.822586    33.65572     .00292    4545.55
newnadacpe~t |     20,259    1.774234    33.38694      .0031   4507.106
classifica~g |          0
-------------+---------------------------------------------------------
percentcha~e |     20,259   -4.012886    11.90846     -58.24     534.14
percentcha~r |          0
primaryrea~n |          0
   startdate |          0
     enddate |          0
-------------+---------------------------------------------------------
        year |     20,259        2016           0       2016       2016
       month |     20,259           5           0          5          5
         day |     20,259          18           0         18         18

by Jean Roth , jroth@nber.org , 10 Feb 2018