Frequencies for first 10,000 rows of ewhorefle variable in nhamcsed2012 dataset :

Who submits |
 orders for |
lab tests - |
 Refused to |
     answer |      Freq.     Percent        Cum.
------------+-----------------------------------
      Blank |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016