Summary statistics for nadacc20171122 dataset :

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

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
ndcdescrip~n |          0
         ndc |          0
oldnadacpe~t |     21,217    2.612957    58.26315     .00229   6034.608
newnadacpe~t |     21,217     2.57097    58.48662     .00226    6046.84
classifica~g |          0
-------------+---------------------------------------------------------
percentcha~e |     21,217   -3.007103    8.874163     -49.34     152.42
percentcha~r |          0
primaryrea~n |          0
   startdate |     21,217       21138           0      21138      21138
     enddate |     21,217       21145           0      21145      21145
-------------+---------------------------------------------------------
effectived~e |     21,217       21145           0      21145      21145
        year |     21,217        2017           0       2017       2017
       month |     21,217          11           0         11         11
         day |     21,217          22           0         22         22

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