Frequencies for first 10,000 rows of prescr7 variable in nhamcsopd2010 dataset :

               prescription status code |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                      prescription drug |      1,012       10.12       10.12
                   nonprescription drug |         54        0.54       10.66
                           undetermined |         26        0.26       10.92
both prescription and otc (over the cou |        308        3.08       14.00
                                      . |      8,600       86.00      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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