Frequencies for first 10,000 rows of prescr1 variable in nhamcsopd2003 dataset :

 prescription status |
 code for medication |
                  #1 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      4,840       48.40       48.40
nonprescription drug |        713        7.13       55.53
        undetermined |        583        5.83       61.36
                   . |      3,864       38.64      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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