Frequencies for first 10,000 rows of prescr2 variable in nhamcsopd1994 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,367       23.67       23.67
          2 |        525        5.25       28.92
          3 |        368        3.68       32.60
          . |      6,740       67.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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