Frequencies for first 10,000 rows of prescr16 variable in nhamcsed2015 dataset 

        Prescription status code for |
                      medication #16 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |         41        0.41        0.41
                        Undetermined |          1        0.01        0.42
Prescription or Nonprescription drug |         20        0.20        0.62
                                   . |      9,938       99.38      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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