Frequencies for first 10,000 rows of prescr7 variable in nhamcsed2015 dataset :

        Prescription status code for |
                       medication #7 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |        456        4.56        4.56
                Nonprescription drug |         20        0.20        4.76
                        Undetermined |          7        0.07        4.83
Prescription or Nonprescription drug |        164        1.64        6.47
                                   . |      9,353       93.53      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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