Frequencies for first 10,000 rows of prescr9 variable in nhamcsed2015 dataset :

        Prescription status code for |
                       medication #9 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |        235        2.35        2.35
                Nonprescription drug |          6        0.06        2.41
                        Undetermined |          3        0.03        2.44
Prescription or Nonprescription drug |         86        0.86        3.30
                                   . |      9,670       96.70      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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