Frequencies for first 10,000 rows of prescr6 variable in nhamcsopd2003 dataset :

 prescription status |
 code for medication |
                  #6 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        771        7.71        7.71
nonprescription drug |        109        1.09        8.80
        undetermined |         76        0.76        9.56
                   . |      9,044       90.44      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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