Does don't know mean no? Analysis of 'don't know' responses in dichotomous choice contingent valuation questions

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Willingness to pay for a Green Energy program: A comparison of ex-ante and ex-post hypothetical bias mitigation approaches (2007, unknown): “…responses are discarded by the researcher and (4) ( ) ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ′ = ′ = = = = = = 3 2 3 2 3 2 3 2 3 2 exp exp α β β κ X X WTP when the don't know response coefficient vector is constrained to be equal to the no response coefficient vector (Carson et al., 1998; Groothuis and Whitehead, 2002).”
Green vs. green: Measuring the compensation required to site electrical generation windmills in a viewshed (2008, methodology): “We follow the status quo approach and code all Don’t Know responses as “Against” responses (Groothuis and Whitehead, 2002; Caudill and Groothuis, 2005).”