Frequencies for first 10,000 rows of prescr3 variable in nhamcsopd1996 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,771       17.71       17.71
          2 |        300        3.00       20.71
          3 |        163        1.63       22.34
          . |      7,766       77.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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