Frequencies for first 10,000 rows of prescr1 variable in nhamcsed2012 dataset :

        Prescription status code for |
                       medication #1 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |      4,569       45.69       45.69
                Nonprescription drug |        109        1.09       46.78
                        Undetermined |         76        0.76       47.54
Prescription or Nonprescription drug |      2,750       27.50       75.04
                                   . |      2,496       24.96      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016