Frequencies for first 10,000 rows of prescr8 variable in nhamcsopd2003 dataset :

 prescription status |
 code for medication |
                  #8 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        424        4.24        4.24
nonprescription drug |         73        0.73        4.97
        undetermined |         43        0.43        5.40
                   . |      9,460       94.60      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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