Frequencies for first 10,000 rows of prescr7 variable in nhamcsed2003 dataset :

 prescription status |
 code for medication |
                  #7 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        266        2.66        2.66
nonprescription drug |         46        0.46        3.12
        undetermined |         34        0.34        3.46
                   . |      9,654       96.54      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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