Frequencies for first 10,000 rows of prescr2 variable in nhamcsed2014 dataset :

        Prescription status code for |
                       medication #2 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |      3,373       33.73       33.73
                Nonprescription drug |        110        1.10       34.83
                        Undetermined |         59        0.59       35.42
Prescription or Nonprescription drug |      1,891       18.91       54.33
                                   . |      4,567       45.67      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017