Frequencies for first 10,000 rows of prescr3 variable in namcs2000 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,763       17.63       17.63
          2 |        193        1.93       19.56
          3 |        187        1.87       21.43
          . |      7,857       78.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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