Frequencies for first 10,000 rows of prescr1 variable in namcs1998 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,437       54.37       54.37
          2 |        632        6.32       60.69
          3 |        432        4.32       65.01
          . |      3,499       34.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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