Can you ever be certain? Reducing hypothetical bias in stated choice experiments via respondent reported choice certainty

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Hypothetical bias in stated choice experiments: Part II. Macro-scale analysis of literature and effectiveness of bias mitigation methods (2021, methodology): “…Between Absolute Yes - SC model estimates were prone to HB - Cheap talk and certainty scales when combined have the potential to compensate for HB Beck et al. (2016) Certainty scale Driving behaviour Between Absolute Mixed - Incorrect calibration of responses can worsen the magnitude of HB -”
Real consequences matter: Why hypothetical biases in the valuation of time persist even in controlled lab experiments (2019, background): “Also approaches for ex-post corrections of hypothetical biases have been suggested, often based on the certainty indicated by the respondent (“certainty correction”) regarding his/her choice (Beck et al., 2016; Blumenschein et al., 1998).”