Frequencies for first 10,000 rows of prescr6 variable in nhamcsopd2009 dataset :

      for rx6, prescription status code |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                      prescription drug |      1,248       12.48       12.48
                   nonprescription drug |         67        0.67       13.15
                           undetermined |         27        0.27       13.42
both prescription and otc (over the cou |        335        3.35       16.77
                                      . |      8,323       83.23      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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