Frequencies for first 10,000 rows of prescr30 variable in namcs2014 dataset :

          Prescription status code for |
                        medication #30 |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     Prescription drug |          2        0.02        0.02
                          Undetermined |          1        0.01        0.03
Both Prescription and Over-The-Counter |          3        0.03        0.06
                                     . |      9,994       99.94      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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