Frequencies for first 10,000 rows of prescr2 variable in nhamcsopd2008 dataset :

            for rx2, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      3,926       39.26       39.26
nonprescription drug |        234        2.34       41.60
        undetermined |        127        1.27       42.87
                   5 |        689        6.89       49.76
                   . |      5,024       50.24      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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