Frequencies for first 10,000 rows of prescr9 variable in nhamcsed2012 dataset :

        Prescription status code for |
                       medication #9 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |        111        1.11        1.11
                Nonprescription drug |          6        0.06        1.17
                        Undetermined |          3        0.03        1.20
Prescription or Nonprescription drug |         55        0.55        1.75
                                   . |      9,825       98.25      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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