Frequencies for first 10,000 rows of prescr4 variable in namcs2011 dataset :

   Medication #4 - Prescription status |
                                  code |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     Prescription drug |      2,362       23.62       23.62
                  Nonprescription drug |         80        0.80       24.42
                          Undetermined |         41        0.41       24.83
Both Prescription and Over-The-Counter |        554        5.54       30.37
                                     . |      6,963       69.63      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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