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- W2106788511 abstract "Abstract It is a common finding in empirical discrete choice studies that the estimated mean relative values of the coefficients (i.e. WTP’s) from multinomial logit (MNL) estimations differ from those calculated using mixed logit estimations, where the mixed logit has the better statistical fit. However, it is less clear under exactly what circumstances such differences arise, whether they are important, and if they can be seen as biases in the WTP estimates from MNL. We use datasets created by Monte Carlo simulation to test, in a controlled environment, the effects of the different possible sources of bias on the accuracy of WTP’s estimated by MNL. Consistent with earlier research we find that random unobserved heterogeneity in the marginal utilities does not in itself biases the MNL estimates. Furthermore, whether or not the unobserved heterogeneity is symmetrically shaped also does not affect the accuracy of the WTP estimates of MNL. However, we find that if two heterogeneous marginal utilities are correlated then the WTP’s from MNL may be biased. If the correlation between the marginal utilities is negative, then the bias in the MNL estimate is negative, whereas if the correlation is positive the bias is positive." @default.
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- W2106788511 date "2010-01-01" @default.
- W2106788511 modified "2023-09-25" @default.
- W2106788511 title "Biases in Willingness-to-Pay Measures from Multinomial Logit Estimates Due to Unobserved Heterogeneity" @default.
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- W2106788511 doi "https://doi.org/10.2139/ssrn.1539880" @default.
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