Frequencies for first 10,000 rows of prescr11 variable in nhamcsed2012 dataset :

        Prescription status code for |
                      medication #11 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |         31        0.31        0.31
                Nonprescription drug |          2        0.02        0.33
Prescription or Nonprescription drug |         10        0.10        0.43
                                   . |      9,957       99.57      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016