Frequencies for first 10,000 rows of prescr6 variable in namcs2000 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        328        3.28        3.28
          2 |         54        0.54        3.82
          3 |         38        0.38        4.20
          . |      9,580       95.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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