Frequencies for first 10,000 rows of prescr6 variable in namcs1997 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        444        4.44        4.44
          2 |         89        0.89        5.33
          3 |         36        0.36        5.69
          . |      9,431       94.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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