Frequencies for first 10,000 rows of prescr1 variable in namcs2011 dataset :

   Medication #1 - Prescription status |
                                  code |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     Prescription drug |      6,293       62.93       62.93
                  Nonprescription drug |        204        2.04       64.97
                          Undetermined |        165        1.65       66.62
Both Prescription and Over-The-Counter |      1,268       12.68       79.30
                                     . |      2,070       20.70      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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