Frequencies for first 10,000 rows of prescr5 variable in nhamcsopd2010 dataset :

               prescription status code |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                      prescription drug |      1,698       16.98       16.98
                   nonprescription drug |         80        0.80       17.78
                           undetermined |         36        0.36       18.14
both prescription and otc (over the cou |        450        4.50       22.64
                                      . |      7,736       77.36      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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