Frequencies for first 10,000 rows of prescr2 variable in namcs2008 dataset :

              prescription status code |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     prescription drug |      4,518       45.18       45.18
                  nonprescription drug |        238        2.38       47.56
                          undetermined |        114        1.14       48.70
both prescription and over-the-counter |        784        7.84       56.54
                                     . |      4,346       43.46      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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