Frequencies for first 10,000 rows of prescr25 variable in nhamcsed2015 dataset 

        Prescription status code for |
                      medication #25 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |          7        0.07        0.07
                Nonprescription drug |          1        0.01        0.08
Prescription or Nonprescription drug |          6        0.06        0.14
                                   . |      9,986       99.86      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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