Frequencies for first 10,000 rows of prescr12 variable in nhamcsed2012 dataset :

        Prescription status code for |
                      medication #12 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |         12        0.12        0.12
Prescription or Nonprescription drug |          2        0.02        0.14
                                   . |      9,986       99.86      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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