Frequencies for first 10,000 rows of prescr1 variable in nhamcsed2015 dataset :

        Prescription status code for |
                       medication #1 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |      4,580       45.80       45.80
                Nonprescription drug |        139        1.39       47.19
                        Undetermined |         95        0.95       48.14
Prescription or Nonprescription drug |      3,175       31.75       79.89
                                   . |      2,011       20.11      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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