Frequencies for first 10,000 rows of prescr21 variable in nhamcsed2014 dataset :

        Prescription status code for |
                      medication #21 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |         13        0.13        0.13
                        Undetermined |          1        0.01        0.14
Prescription or Nonprescription drug |          5        0.05        0.19
                                   . |      9,981       99.81      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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