Frequencies for first 10,000 rows of prescr5 variable in nhamcsed2008 dataset :

   for rx5, prescription status code |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   prescription drug |        652        6.52        6.52
                nonprescription drug |         47        0.47        6.99
                        undetermined |         26        0.26        7.25
prescription or nonprescription drug |        141        1.41        8.66
                                   . |      9,134       91.34      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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