Frequencies for first 10,000 rows of prescr5 variable in nhamcsopd1992 dataset :

Prescriptio |
   n status |
   code for |
 medication |
         #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        346        3.46        3.46
          2 |         66        0.66        4.12
          3 |         42        0.42        4.54
          . |      9,546       95.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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