Frequencies for first 10,000 rows of prescr23 variable in nhamcsed2015 dataset 

        Prescription status code for |
                      medication #23 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                   Prescription drug |         11        0.11        0.11
                Nonprescription drug |          1        0.01        0.12
Prescription or Nonprescription drug |          8        0.08        0.20
                                   . |      9,980       99.80      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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