Frequencies for first 10,000 rows of prescr4 variable in nhamcsed2003 dataset :

 prescription status |
 code for medication |
                  #4 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      1,174       11.74       11.74
nonprescription drug |        221        2.21       13.95
        undetermined |        127        1.27       15.22
                   . |      8,478       84.78      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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