Frequencies for first 10,000 rows of prescr7 variable in nhamcsed2008 dataset :

   for rx7, prescription status code |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   prescription drug |        196        1.96        1.96
                nonprescription drug |         15        0.15        2.11
                        undetermined |          4        0.04        2.15
prescription or nonprescription drug |         44        0.44        2.59
                                   . |      9,741       97.41      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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