Frequencies for first 10,000 rows of prescr1 variable in namcs1994 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,230       62.30       62.30
          2 |        512        5.12       67.42
          3 |        875        8.75       76.17
          . |      2,383       23.83      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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