Frequencies for first 10,000 rows of prescr18 variable in nhamcsed2014 dataset :

        Prescription status code for |
                      medication #18 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |         21        0.21        0.21
                Nonprescription drug |          1        0.01        0.22
                        Undetermined |          1        0.01        0.23
Prescription or Nonprescription drug |          7        0.07        0.30
                                   . |      9,970       99.70      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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