Frequencies for first 10,000 rows of prescr4 variable in nhamcsed1992 dataset :

Prescriptio |
   n status |
   code for |
    drug #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        368        3.68        3.68
          2 |         82        0.82        4.50
          3 |         73        0.73        5.23
          . |      9,477       94.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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