Frequencies for first 10,000 rows of prescr6 variable in nhamcsed2005 dataset :

 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        288        2.88        2.88
nonprescription drug |         55        0.55        3.43
        undetermined |         33        0.33        3.76
                   . |      9,624       96.24      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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