Frequencies for first 10,000 rows of prescr2 variable in nhamcsed2009 dataset :

   for rx2, |
prescriptio |
   n status |
       code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,646       36.46       36.46
          2 |        309        3.09       39.55
          3 |         65        0.65       40.20
          5 |      1,039       10.39       50.59
          . |      4,941       49.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016