Frequencies for first 10,000 rows of prescr2 variable in nhamcsed2012 dataset :

        Prescription status code for |
                       medication #2 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |      3,267       32.67       32.67
                Nonprescription drug |        101        1.01       33.68
                        Undetermined |         64        0.64       34.32
Prescription or Nonprescription drug |      1,695       16.95       51.27
                                   . |      4,873       48.73      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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