Frequencies for first 10,000 rows of prescr7 variable in namcs2010 dataset :

              prescription status code |      Freq.     Percent        Cum.
---------------------------------------+-----------------------------------
                     prescription drug |        834        8.34        8.34
                  nonprescription drug |         41        0.41        8.75
                          undetermined |         15        0.15        8.90
both prescription and over-the-counter |        249        2.49       11.39
                                     . |      8,861       88.61      100.00
---------------------------------------+-----------------------------------
                                 Total |     10,000      100.00

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