Frequencies for first 10,000 rows of prescr1 variable in nhamcsopd1995 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,566       45.66       45.66
          2 |        806        8.06       53.72
          3 |        582        5.82       59.54
          . |      4,046       40.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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