Frequencies for first 10,000 rows of prescr6 variable in nhamcsed2012 dataset :

        Prescription status code for |
                       medication #6 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |        399        3.99        3.99
                Nonprescription drug |         10        0.10        4.09
                        Undetermined |         12        0.12        4.21
Prescription or Nonprescription drug |        209        2.09        6.30
                                   . |      9,370       93.70      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016