Frequencies for first 10,000 rows of prescr7 variable in nhamcsopd2004 dataset :

 prescription status |
 code for medication |
                  #7 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        633        6.33        6.33
nonprescription drug |         74        0.74        7.07
        undetermined |         57        0.57        7.64
                   . |      9,236       92.36      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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