Frequencies for first 10,000 rows of prescr5 variable in nhamcsopd2008 dataset :

            for rx5, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      1,543       15.43       15.43
nonprescription drug |         94        0.94       16.37
        undetermined |         45        0.45       16.82
                   5 |        357        3.57       20.39
                   . |      7,961       79.61      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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