Frequencies for first 10,000 rows of prescr3 variable in namcs2012 dataset :

          Prescription status code for |
                          medication 3 |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     Prescription drug |      2,605       26.05       26.05
                  Nonprescription drug |         92        0.92       26.97
                          Undetermined |         99        0.99       27.96
Both Prescription and Over-The-Counter |        671        6.71       34.67
                                     . |      6,533       65.33      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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