Frequencies for first 10,000 rows of prescr9 variable in nhamcsed2013 dataset :

        Prescription status code for |
                       medication #9 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |        129        1.29        1.29
                Nonprescription drug |          5        0.05        1.34
                        Undetermined |          1        0.01        1.35
Prescription or Nonprescription drug |         40        0.40        1.75
                                   . |      9,825       98.25      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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