Frequencies for first 10,000 rows of prescr6 variable in nhamcsopd2001 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        537        5.37        5.37
          2 |         82        0.82        6.19
          3 |         81        0.81        7.00
          . |      9,300       93.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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