Frequencies for first 10,000 rows of prescr5 variable in namcs1998 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        486        4.86        4.86
          2 |         64        0.64        5.50
          3 |         28        0.28        5.78
          . |      9,422       94.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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