Frequencies for first 10,000 rows of prescr1 variable in namcs1996 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      8,361       83.61       83.61
          2 |        796        7.96       91.57
          3 |        823        8.23       99.80
          . |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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