Frequencies for first 10,000 rows of prescr4 variable in nhamcsopd2001 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,201       12.01       12.01
          2 |        172        1.72       13.73
          3 |        126        1.26       14.99
          . |      8,501       85.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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