Frequencies for first 10,000 rows of prescr2 variable in namcs2009 dataset :

              prescription status code |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     prescription drug |      4,426       44.26       44.26
                  nonprescription drug |        214        2.14       46.40
                          undetermined |         97        0.97       47.37
both prescription and over-the-counter |        890        8.90       56.27
                                     . |      4,373       43.73      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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