Frequencies for first 10,000 rows of prescr1 variable in nhamcsed2008 dataset :

   for rx1, prescription status code |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   prescription drug |      5,402       54.02       54.02
                nonprescription drug |        572        5.72       59.74
                        undetermined |        165        1.65       61.39
prescription or nonprescription drug |      1,698       16.98       78.37
                                   . |      2,163       21.63      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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