Frequencies for first 10,000 rows of prescr3 variable in nhamcsopd2010 dataset :

               prescription status code |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                      prescription drug |      2,841       28.41       28.41
                   nonprescription drug |        144        1.44       29.85
                           undetermined |         74        0.74       30.59
both prescription and otc (over the cou |        770        7.70       38.29
                                      . |      6,171       61.71      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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