Frequencies for first 10,000 rows of prescr4 variable in nhamcsed2014 dataset :

        Prescription status code for |
                       medication #4 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |      1,368       13.68       13.68
                Nonprescription drug |         54        0.54       14.22
                        Undetermined |         27        0.27       14.49
Prescription or Nonprescription drug |        665        6.65       21.14
                                   . |      7,886       78.86      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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