Frequencies for first 10,000 rows of prescr8 variable in nhamcsopd2005 dataset :

 prescription status |
     code for med #8 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |        328        3.28        3.28
nonprescription drug |         56        0.56        3.84
        undetermined |         29        0.29        4.13
                   . |      9,587       95.87      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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