Frequencies for first 10,000 rows of prescr1 variable in namcs2003 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,454       54.54       54.54
          2 |        421        4.21       58.75
          3 |        397        3.97       62.72
          . |      3,728       37.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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