Frequencies for first 10,000 rows of prescr1 variable in nhamcsed2006 dataset :

            for rx1, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      5,313       53.13       53.13
nonprescription drug |      1,371       13.71       66.84
        undetermined |      1,025       10.25       77.09
                   . |      2,291       22.91      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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