Frequencies for first 10,000 rows of prescr4 variable in nhamcsopd1995 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        878        8.78        8.78
          2 |        139        1.39       10.17
          3 |         75        0.75       10.92
          . |      8,908       89.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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