Frequencies for first 10,000 rows of prescr2 variable in nhamcsopd2005 dataset :

 prescription status |
     code for med #2 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      3,248       32.48       32.48
nonprescription drug |        616        6.16       38.64
        undetermined |        335        3.35       41.99
                   . |      5,801       58.01      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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