Frequencies for first 10,000 rows of prescr3 variable in namcs2011 dataset :

   Medication #3 - Prescription status |
                                  code |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     Prescription drug |      3,136       31.36       31.36
                  Nonprescription drug |        100        1.00       32.36
                          Undetermined |         68        0.68       33.04
Both Prescription and Over-The-Counter |        778        7.78       40.82
                                     . |      5,918       59.18      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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