Frequencies for first 10,000 rows of prescr1 variable in namcs2008 dataset :

              prescription status code |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     prescription drug |      6,616       66.16       66.16
                  nonprescription drug |        369        3.69       69.85
                          undetermined |        145        1.45       71.30
both prescription and over-the-counter |        992        9.92       81.22
                                     . |      1,878       18.78      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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