Frequencies for first 10,000 rows of prescr6 variable in namcs2009 dataset :

              prescription status code |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     prescription drug |      1,259       12.59       12.59
                  nonprescription drug |         76        0.76       13.35
                          undetermined |         38        0.38       13.73
both prescription and over-the-counter |        310        3.10       16.83
                                     . |      8,317       83.17      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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