Frequencies for first 10,000 rows of prescr18 variable in namcs2014 dataset :

          Prescription status code for |
                        medication #18 |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     Prescription drug |         81        0.81        0.81
                  Nonprescription drug |          7        0.07        0.88
                          Undetermined |          3        0.03        0.91
Both Prescription and Over-The-Counter |         33        0.33        1.24
                                     . |      9,876       98.76      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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