Frequencies for first 10,000 rows of prescr3 variable in nhamcsopd1999 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,721       17.21       17.21
          2 |        229        2.29       19.50
          3 |        173        1.73       21.23
          . |      7,877       78.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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