Frequencies for first 10,000 rows of prescr1 variable in nhamcsed2005 dataset :

 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      5,468       54.68       54.68
nonprescription drug |      1,325       13.25       67.93
        undetermined |        943        9.43       77.36
                   . |      2,264       22.64      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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