Frequencies for first 10,000 rows of prescr3 variable in namcs1999 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,692       16.92       16.92
          2 |        161        1.61       18.53
          3 |        124        1.24       19.77
          . |      8,023       80.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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