Frequencies for first 10,000 rows of prescr2 variable in namcs2004 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,892       28.92       28.92
          2 |        301        3.01       31.93
          3 |        208        2.08       34.01
          . |      6,599       65.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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