Frequencies for first 10,000 rows of prescr5 variable in namcs1995 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        602        6.02        6.02
          2 |         70        0.70        6.72
          3 |         34        0.34        7.06
          . |      9,294       92.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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