Frequencies for first 10,000 rows of prescr2 variable in nhamcsopd2000 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,804       28.04       28.04
          2 |        433        4.33       32.37
          3 |        392        3.92       36.29
          . |      6,371       63.71      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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