Frequencies for first 10,000 rows of prescr2 variable in namcs2013 dataset :

          Prescription status code for |
                         medication #2 |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     Prescription drug |      3,869       38.69       38.69
                  Nonprescription drug |        160        1.60       40.29
                          Undetermined |        173        1.73       42.02
Both Prescription and Over-The-Counter |      1,109       11.09       53.11
                                     . |      4,689       46.89      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017