Frequencies for first 10,000 rows of prescr4 variable in nhamcsed1995 dataset :

prescriptio |
   n status |
   code for |
    drug #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        621        6.21        6.21
          2 |        111        1.11        7.32
          3 |         75        0.75        8.07
          . |      9,193       91.93      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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