Frequencies for first 10,000 rows of prescr5 variable in nhamcsopd1994 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        309        3.09        3.09
          2 |         64        0.64        3.73
          3 |         51        0.51        4.24
          . |      9,576       95.76      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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