Summary statistics for package dataset :

by Jean Roth , jroth@nber.org , 11 May 2018

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
      prodid |          0
         ndc |          0
    packcode |          0
    packdesc |          0
stmarkdate~r |          0
-------------+---------------------------------------------------------
  stmarkdate |    232,072    17374.27     5027.01     -21914      21314
endmarkdat~r |          0
 endmarkdate |      4,087    21699.55    477.1514      21315      28520
ndc_exclud~g |          0
sample_pac~e |          0

by Jean Roth , jroth@nber.org , 11 May 2018