Frequencies for first 10,000 rows of prescr3 variable in namcs2010 dataset :

              prescription status code |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     prescription drug |      3,027       30.27       30.27
                  nonprescription drug |        111        1.11       31.38
                          undetermined |         66        0.66       32.04
both prescription and over-the-counter |        696        6.96       39.00
                                     . |      6,100       61.00      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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