Frequencies for first 10,000 rows of prescr3 variable in nhamcsopd2001 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,810       18.10       18.10
          2 |        193        1.93       20.03
          3 |        219        2.19       22.22
          . |      7,778       77.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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