Frequencies for first 10,000 rows of prescr3 variable in namcs1995 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,868       18.68       18.68
          2 |        230        2.30       20.98
          3 |        130        1.30       22.28
          . |      7,772       77.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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