Frequencies for first 10,000 rows of prescr1 variable in namcs2009 dataset :

              prescription status code |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     prescription drug |      6,409       64.09       64.09
                  nonprescription drug |        311        3.11       67.20
                          undetermined |        157        1.57       68.77
both prescription and over-the-counter |      1,077       10.77       79.54
                                     . |      2,046       20.46      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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