Frequencies for first 10,000 rows of prescr1 variable in namcs1999 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,469       54.69       54.69
          2 |        459        4.59       59.28
          3 |        430        4.30       63.58
          . |      3,642       36.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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