Frequencies for first 10,000 rows of prescr22 variable in nhamcsed2015 dataset 

        Prescription status code for |
                      medication #22 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |         16        0.16        0.16
Prescription or Nonprescription drug |          6        0.06        0.22
                                   . |      9,978       99.78      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017