Frequencies for first 10,000 rows of prescr7 variable in nhamcsed2013 dataset :

        Prescription status code for |
                       medication #7 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |        282        2.82        2.82
                Nonprescription drug |         13        0.13        2.95
                        Undetermined |          7        0.07        3.02
Prescription or Nonprescription drug |        136        1.36        4.38
                                   . |      9,562       95.62      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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