Frequencies for first 10,000 rows of prescr2 variable in nhamcsopd1998 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,798       27.98       27.98
          2 |        501        5.01       32.99
          3 |        306        3.06       36.05
          . |      6,395       63.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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