Frequencies for first 10,000 rows of prescr1 variable in nhamcsed2003 dataset :

 prescription status |
 code for medication |
                  #1 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   prescription drug |      5,410       54.10       54.10
nonprescription drug |      1,233       12.33       66.43
        undetermined |      1,058       10.58       77.01
                   . |      2,299       22.99      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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