Frequencies for first 10,000 rows of prescr7 variable in namcs2009 dataset :

              prescription status code |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     prescription drug |        955        9.55        9.55
                  nonprescription drug |         58        0.58       10.13
                          undetermined |         24        0.24       10.37
both prescription and over-the-counter |        218        2.18       12.55
                                     . |      8,745       87.45      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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