Frequencies for first 10,000 rows of prescr8 variable in namcs2008 dataset :

              prescription status code |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     prescription drug |        573        5.73        5.73
                  nonprescription drug |         34        0.34        6.07
                          undetermined |         19        0.19        6.26
both prescription and over-the-counter |        156        1.56        7.82
                                     . |      9,218       92.18      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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