Frequencies for first 10,000 rows of prescr1 variable in namcs2005 dataset :

prescriptio |
   n status |
   code for |
     med #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      6,289       62.89       62.89
          2 |        666        6.66       69.55
          3 |        424        4.24       73.79
          . |      2,621       26.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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