Frequencies for first 10,000 rows of prescr4 variable in namcs2012 dataset :

          Prescription status code for |
                          medication 4 |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     Prescription drug |      1,852       18.52       18.52
                  Nonprescription drug |         71        0.71       19.23
                          Undetermined |         79        0.79       20.02
Both Prescription and Over-The-Counter |        528        5.28       25.30
                                     . |      7,470       74.70      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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