Frequencies for first 10,000 rows of prescr4 variable in namcs2001 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        852        8.52        8.52
          2 |         89        0.89        9.41
          3 |         43        0.43        9.84
          . |      9,016       90.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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