Frequencies for first 10,000 rows of prescr4 variable in namcs1997 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,324       13.24       13.24
          2 |        237        2.37       15.61
          3 |         98        0.98       16.59
          . |      8,341       83.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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