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. 2021 Jun 12;28(41):58701–58720. doi: 10.1007/s11356-021-14790-w

Table 13.

Results of mean willingness to pay using different models

Variable/model Probit Probit with covariates Doubleleb Doubleleb model with covariate
Mean willingness to pay 353.87*** 208.56*** 276.56*** 152.66***
Standard error 47.72 44.75 10.45 27.72