Frequencies for first 10,000 rows of prescr4 variable in nhamcsopd1997 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        848        8.48        8.48
          2 |        151        1.51        9.99
          3 |         57        0.57       10.56
          . |      8,944       89.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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