Frequencies for first 10,000 rows of prescr8 variable in nhamcsed2013 dataset :

        Prescription status code for |
                       medication #8 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |        168        1.68        1.68
                Nonprescription drug |          8        0.08        1.76
                        Undetermined |          3        0.03        1.79
Prescription or Nonprescription drug |         73        0.73        2.52
                                   . |      9,748       97.48      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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