Frequencies for first 10,000 rows of prescr6 variable in nhamcsed2013 dataset :

        Prescription status code for |
                       medication #6 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |        499        4.99        4.99
                Nonprescription drug |         20        0.20        5.19
                        Undetermined |         12        0.12        5.31
Prescription or Nonprescription drug |        207        2.07        7.38
                                   . |      9,262       92.62      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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