Frequencies for first 10,000 rows of prescr5 variable in namcs2012 dataset :

          Prescription status code for |
                          medication 5 |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     Prescription drug |      1,334       13.34       13.34
                  Nonprescription drug |         77        0.77       14.11
                          Undetermined |         50        0.50       14.61
Both Prescription and Over-The-Counter |        419        4.19       18.80
                                     . |      8,120       81.20      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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