Frequencies for first 10,000 rows of prescr20 variable in namcs2014 dataset :

          Prescription status code for |
                        medication #20 |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     Prescription drug |         48        0.48        0.48
                  Nonprescription drug |          4        0.04        0.52
                          Undetermined |          2        0.02        0.54
Both Prescription and Over-The-Counter |         21        0.21        0.75
                                     . |      9,925       99.25      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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