Frequencies for first 10,000 rows of prescr2 variable in nhamcsed2010 dataset :

            Prescription status code |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   prescription drug |      4,034       40.34       40.34
                nonprescription drug |        102        1.02       41.36
                        undetermined |         41        0.41       41.77
prescription or nonprescription drug |      1,281       12.81       54.58
                                   . |      4,542       45.42      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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