Frequencies for first 10,000 rows of prescr1 variable in namcs2000 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      5,584       55.84       55.84
          2 |        565        5.65       61.49
          3 |        533        5.33       66.82
          . |      3,318       33.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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