Frequencies for first 10,000 rows of prescr5 variable in nhamcsed2010 dataset :

            Prescription status code |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   prescription drug |        787        7.87        7.87
                nonprescription drug |         31        0.31        8.18
                        undetermined |         15        0.15        8.33
prescription or nonprescription drug |        239        2.39       10.72
                                   . |      8,928       89.28      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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