Frequencies for first 10,000 rows of prescr4 variable in nhamcsopd2000 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,125       11.25       11.25
          2 |        148        1.48       12.73
          3 |        120        1.20       13.93
          . |      8,607       86.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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