Frequencies for first 10,000 rows of prescr2 variable in nhamcsopd2001 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,768       27.68       27.68
          2 |        400        4.00       31.68
          3 |        367        3.67       35.35
          . |      6,465       64.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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