Frequencies for first 10,000 rows of prescr20 variable in nhamcsed2014 dataset :

        Prescription status code for |
                      medication #20 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |         17        0.17        0.17
                Nonprescription drug |          1        0.01        0.18
                        Undetermined |          1        0.01        0.19
Prescription or Nonprescription drug |          4        0.04        0.23
                                   . |      9,977       99.77      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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