Frequencies for first 10,000 rows of prescr7 variable in nhamcsopd2005 dataset :

 prescription status |
     code for med #7 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        497        4.97        4.97
nonprescription drug |         85        0.85        5.82
        undetermined |         42        0.42        6.24
                   . |      9,376       93.76      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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