Frequencies for first 10,000 rows of prescr6 variable in namcs2002 dataset :

 Prescription status |
 code for medication |
                  #6 |      Freq.     Percent        Cum.
---------------------+-----------------------------------
   Prescription drug |        510        5.10        5.10
Nonprescription drug |         72        0.72        5.82
        Undetermined |         39        0.39        6.21
                   . |      9,379       93.79      100.00
---------------------+-----------------------------------
               Total |     10,000      100.00

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