Frequencies for first 10,000 rows of prescr1 variable in nhamcsed2014 dataset :

        Prescription status code for |
                       medication #1 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |      4,564       45.64       45.64
                Nonprescription drug |        117        1.17       46.81
                        Undetermined |        108        1.08       47.89
Prescription or Nonprescription drug |      3,102       31.02       78.91
                                   . |      2,109       21.09      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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