Frequencies for first 10,000 rows of prescr7 variable in nhamcsopd2003 dataset :

 prescription status |
 code for medication |
                  #7 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        587        5.87        5.87
nonprescription drug |         85        0.85        6.72
        undetermined |         50        0.50        7.22
                   . |      9,278       92.78      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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