Frequencies for first 10,000 rows of prescr4 variable in nhamcsed2015 dataset :

        Prescription status code for |
                       medication #4 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |      1,594       15.94       15.94
                Nonprescription drug |         45        0.45       16.39
                        Undetermined |         36        0.36       16.75
Prescription or Nonprescription drug |        753        7.53       24.28
                                   . |      7,572       75.72      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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