Frequencies for first 10,000 rows of prescr3 variable in namcs2008 dataset :

              prescription status code |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     prescription drug |      3,125       31.25       31.25
                  nonprescription drug |        140        1.40       32.65
                          undetermined |         78        0.78       33.43
both prescription and over-the-counter |        637        6.37       39.80
                                     . |      6,020       60.20      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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