Frequencies for first 10,000 rows of prescr6 variable in nhamcsopd2006 dataset :

            for rx6, |
 prescription status |
                code |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   Prescription drug |        823        8.23        8.23
Nonprescription drug |        153        1.53        9.76
        Undetermined |         78        0.78       10.54
                   . |      8,946       89.46      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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