Frequencies for first 10,000 rows of prescr7 variable in nhamcsed2014 dataset :

        Prescription status code for |
                       medication #7 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |        362        3.62        3.62
                Nonprescription drug |         12        0.12        3.74
                        Undetermined |          5        0.05        3.79
Prescription or Nonprescription drug |        144        1.44        5.23
                                   . |      9,477       94.77      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017