Frequencies for first 10,000 rows of prescr8 variable in nhamcsed2008 dataset :

   for rx8, prescription status code |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   prescription drug |        108        1.08        1.08
                nonprescription drug |         10        0.10        1.18
                        undetermined |          3        0.03        1.21
prescription or nonprescription drug |         25        0.25        1.46
                                   . |      9,854       98.54      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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