Frequencies for first 10,000 rows of prescr2 variable in namcs1997 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,761       47.61       47.61
          2 |        668        6.68       54.29
          3 |        361        3.61       57.90
          . |      4,210       42.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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