Frequencies for first 10,000 rows of prescr8 variable in nhamcsed2010 dataset :

            Prescription status code |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   prescription drug |        128        1.28        1.28
                nonprescription drug |          5        0.05        1.33
                        undetermined |          4        0.04        1.37
prescription or nonprescription drug |         30        0.30        1.67
                                   . |      9,833       98.33      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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