Frequencies for first 10,000 rows of prescr8 variable in namcs2009 dataset :

              prescription status code |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     prescription drug |        647        6.47        6.47
                  nonprescription drug |         54        0.54        7.01
                          undetermined |         20        0.20        7.21
both prescription and over-the-counter |        183        1.83        9.04
                                     . |      9,096       90.96      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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