Frequencies for first 10,000 rows of prescr7 variable in nhamcsed2011 dataset :

        Prescription status code for |
                       medication #7 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |        251        2.51        2.51
                Nonprescription drug |          5        0.05        2.56
                        Undetermined |          7        0.07        2.63
Prescription or Nonprescription drug |         73        0.73        3.36
                                   . |      9,664       96.64      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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