Frequencies for first 10,000 rows of prescr4 variable in nhamcsed2008 dataset :

   for rx4, prescription status code |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   prescription drug |      1,251       12.51       12.51
                nonprescription drug |         82        0.82       13.33
                        undetermined |         37        0.37       13.70
prescription or nonprescription drug |        292        2.92       16.62
                                   . |      8,338       83.38      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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