Frequencies for first 10,000 rows of prescr1 variable in nhamcsopd1994 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,435       44.35       44.35
          2 |        894        8.94       53.29
          3 |        765        7.65       60.94
          . |      3,906       39.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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