Frequencies for first 10,000 rows of prescr3 variable in nhamcsed2014 dataset :

        Prescription status code for |
                       medication #3 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |      2,254       22.54       22.54
                Nonprescription drug |         76        0.76       23.30
                        Undetermined |         40        0.40       23.70
Prescription or Nonprescription drug |      1,082       10.82       34.52
                                   . |      6,548       65.48      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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