Frequencies for first 10,000 rows of prescr4 variable in nhamcsopd2009 dataset :

      for rx4, prescription status code |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                      prescription drug |      2,104       21.04       21.04
                   nonprescription drug |        108        1.08       22.12
                           undetermined |         41        0.41       22.53
both prescription and otc (over the cou |        489        4.89       27.42
                                      . |      7,258       72.58      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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