Sample restrictions and the elicitation of a constant willingness to pay per quality adjusted life year

Abstract It is well established that the underlying theoretical assumptions needed to obtain a constant proportional trade‐off between a quality adjusted life year (QALY) and willingness to pay (WTP) are restrictive and often empirically violated. In this paper, we set out to investigate whether the proportionality conditions (in terms of scope insensitivity and severity independence) can be satisfied when data is restricted to include only respondents who pass certain consistency criteria. We hypothesize that the more we restrict the data, the better the compliance with the requirement of constant proportional trade‐off between WTP and QALY. We revisit the Danish data from the Europ...

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