Frequencies for first 10,000 rows of prescr6 variable in namcs2010 dataset :

              prescription status code |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     prescription drug |      1,129       11.29       11.29
                  nonprescription drug |         54        0.54       11.83
                          undetermined |         19        0.19       12.02
both prescription and over-the-counter |        329        3.29       15.31
                                     . |      8,469       84.69      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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