Frequencies for first 10,000 rows of prescr7 variable in nhamcsed2009 dataset :

   for rx7, |
prescriptio |
   n status |
       code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        195        1.95        1.95
          2 |         15        0.15        2.10
          3 |          7        0.07        2.17
          5 |         50        0.50        2.67
          . |      9,733       97.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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