Frequencies for first 10,000 rows of prescr3 variable in nhamcsed2009 dataset :

   for rx3, |
prescriptio |
   n status |
       code |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,145       21.45       21.45
          2 |        144        1.44       22.89
          3 |         47        0.47       23.36
          5 |        543        5.43       28.79
          . |      7,121       71.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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