Frequencies for first 10,000 rows of prescr6 variable in nhamcsed2004 dataset :

 prescription status |
 code for medication |
                  #6 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        575        5.75        5.75
nonprescription drug |        104        1.04        6.79
        undetermined |         60        0.60        7.39
                   . |      9,261       92.61      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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