Frequencies for first 10,000 rows of prescr2 variable in nhamcsopd1997 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,537       25.37       25.37
          2 |        552        5.52       30.89
          3 |        242        2.42       33.31
          . |      6,669       66.69      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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