Frequencies for first 10,000 rows of prescr2 variable in nhamcsed2008 dataset :

   for rx2, prescription status code |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   prescription drug |      3,903       39.03       39.03
                nonprescription drug |        352        3.52       42.55
                        undetermined |        120        1.20       43.75
prescription or nonprescription drug |        987        9.87       53.62
                                   . |      4,638       46.38      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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