Frequencies for first 10,000 rows of prescr1 variable in nhamcsopd2002 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      4,508       45.08       45.08
          2 |        664        6.64       51.72
          3 |        448        4.48       56.20
          . |      4,380       43.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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