Frequencies for first 10,000 rows of prescr8 variable in nhamcsed2005 dataset :

 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        100        1.00        1.00
nonprescription drug |         14        0.14        1.14
        undetermined |         10        0.10        1.24
                   . |      9,876       98.76      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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