Frequencies for first 10,000 rows of prescr3 variable in nhamcsed1992 dataset :

Prescriptio |
   n status |
   code for |
    drug #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        835        8.35        8.35
          2 |        214        2.14       10.49
          3 |        151        1.51       12.00
          . |      8,800       88.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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