Frequencies for first 10,000 rows of prescr2 variable in nhamcsed2015 dataset :

        Prescription status code for |
                       medication #2 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |      3,644       36.44       36.44
                Nonprescription drug |         89        0.89       37.33
                        Undetermined |         73        0.73       38.06
Prescription or Nonprescription drug |      1,909       19.09       57.15
                                   . |      4,285       42.85      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017