Frequencies for first 10,000 rows of prescr5 variable in nhamcsopd2005 dataset :

 prescription status |
     code for med #5 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        956        9.56        9.56
nonprescription drug |        154        1.54       11.10
        undetermined |         79        0.79       11.89
                   . |      8,811       88.11      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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