Frequencies for first 10,000 rows of prescr2 variable in nhamcsed2011 dataset :

        Prescription status code for |
                       medication #2 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |      3,620       36.20       36.20
                Nonprescription drug |        105        1.05       37.25
                        Undetermined |         61        0.61       37.86
Prescription or Nonprescription drug |      1,409       14.09       51.95
                                   . |      4,805       48.05      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016