Frequencies for first 10,000 rows of prescr5 variable in namcs2009 dataset :

              prescription status code |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     prescription drug |      1,701       17.01       17.01
                  nonprescription drug |         82        0.82       17.83
                          undetermined |         53        0.53       18.36
both prescription and over-the-counter |        406        4.06       22.42
                                     . |      7,758       77.58      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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