Frequencies for first 10,000 rows of prescr6 variable in nhamcsed2011 dataset :

        Prescription status code for |
                       medication #6 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |        378        3.78        3.78
                Nonprescription drug |         11        0.11        3.89
                        Undetermined |          9        0.09        3.98
Prescription or Nonprescription drug |        143        1.43        5.41
                                   . |      9,459       94.59      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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