Frequencies for first 10,000 rows of prescr2 variable in nhamcsopd2009 dataset :

      for rx2, prescription status code |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                      prescription drug |      3,697       36.97       36.97
                   nonprescription drug |        248        2.48       39.45
                           undetermined |        120        1.20       40.65
both prescription and otc (over the cou |        822        8.22       48.87
                                      . |      5,113       51.13      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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