Frequencies for first 10,000 rows of prescr1 variable in namcs2012 dataset :

              Prescription status code |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     Prescription drug |      5,214       52.14       52.14
                  Nonprescription drug |        211        2.11       54.25
                          Undetermined |        236        2.36       56.61
Both Prescription and Over-The-Counter |      1,178       11.78       68.39
                                     . |      3,161       31.61      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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