Frequencies for first 10,000 rows of prescr2 variable in nhamcsopd2002 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,649       26.49       26.49
          2 |        358        3.58       30.07
          3 |        283        2.83       32.90
          . |      6,710       67.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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