Frequencies for first 10,000 rows of prescr4 variable in nhamcsed2011 dataset :

        Prescription status code for |
                       medication #4 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |      1,176       11.76       11.76
                Nonprescription drug |         27        0.27       12.03
                        Undetermined |         24        0.24       12.27
Prescription or Nonprescription drug |        419        4.19       16.46
                                   . |      8,354       83.54      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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