Frequencies for first 10,000 rows of prescr11 variable in nhamcsed2013 dataset :

        Prescription status code for |
                      medication #11 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |         57        0.57        0.57
                Nonprescription drug |          3        0.03        0.60
                        Undetermined |          2        0.02        0.62
Prescription or Nonprescription drug |         21        0.21        0.83
                                   . |      9,917       99.17      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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