Frequencies for first 10,000 rows of prescr21 variable in nhamcsed2015 dataset 

        Prescription status code for |
                      medication #21 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |         19        0.19        0.19
                Nonprescription drug |          1        0.01        0.20
Prescription or Nonprescription drug |          5        0.05        0.25
                                   . |      9,975       99.75      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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