Frequencies for first 10,000 rows of prescr6 variable in namcs2008 dataset :

              prescription status code |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     prescription drug |      1,145       11.45       11.45
                  nonprescription drug |         56        0.56       12.01
                          undetermined |         32        0.32       12.33
both prescription and over-the-counter |        269        2.69       15.02
                                     . |      8,498       84.98      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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