Frequencies for first 10,000 rows of prescr2 variable in nhamcsed2002 dataset :

prescriptio |
   n status |
   code for |
    drug #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,938       29.38       29.38
          2 |        716        7.16       36.54
          3 |        582        5.82       42.36
          . |      5,764       57.64      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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