Frequencies for first 10,000 rows of prescr4 variable in nhamcsed2006 dataset :

            for rx5, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        954        9.54        9.54
nonprescription drug |        133        1.33       10.87
        undetermined |        141        1.41       12.28
                   . |      8,772       87.72      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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