Frequencies for first 10,000 rows of prescr4 variable in namcs1996 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,601       16.01       16.01
          2 |        252        2.52       18.53
          3 |        131        1.31       19.84
          . |      8,016       80.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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