Frequencies for first 10,000 rows of prescr4 variable in nhamcsopd2010 dataset :

               prescription status code |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                      prescription drug |      2,202       22.02       22.02
                   nonprescription drug |        100        1.00       23.02
                           undetermined |         55        0.55       23.57
both prescription and otc (over the cou |        545        5.45       29.02
                                      . |      7,098       70.98      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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