Frequencies for first 10,000 rows of prescr4 variable in nhamcsopd1998 dataset :

prescriptio |
   n status |
   code for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        881        8.81        8.81
          2 |        154        1.54       10.35
          3 |        108        1.08       11.43
          . |      8,857       88.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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