Frequencies for first 10,000 rows of prescr2 variable in namcs2012 dataset :

          Prescription status code for |
                          medication 2 |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     Prescription drug |      3,537       35.37       35.37
                  Nonprescription drug |        172        1.72       37.09
                          Undetermined |        194        1.94       39.03
Both Prescription and Over-The-Counter |        951        9.51       48.54
                                     . |      5,146       51.46      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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