Frequencies for first 10,000 rows of prescr1 variable in nhamcsopd1996 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,619       46.19       46.19
          2 |        883        8.83       55.02
          3 |        565        5.65       60.67
          . |      3,933       39.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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