Frequencies for first 10,000 rows of prescr7 variable in nhamcsopd2009 dataset :

      for rx7, prescription status code |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                      prescription drug |        940        9.40        9.40
                   nonprescription drug |         54        0.54        9.94
                           undetermined |         17        0.17       10.11
both prescription and otc (over the cou |        265        2.65       12.76
                                      . |      8,724       87.24      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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