Frequencies for first 10,000 rows of prescr1 variable in namcs2013 dataset :

          Prescription status code for |
                         medication #1 |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     Prescription drug |      5,389       53.89       53.89
                  Nonprescription drug |        200        2.00       55.89
                          Undetermined |        201        2.01       57.90
Both Prescription and Over-The-Counter |      1,425       14.25       72.15
                                     . |      2,785       27.85      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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