Table 5.

Parametric WTP and WTA distribution function (only includes individuals willing to get vaccinated) [n = 1664]

Features of the WTA and WTP distribution	Vaccine efficacy (%)
	95	70	50
${\theta }_1{,\theta }_2$, and $(1-{\theta }_1{-\theta }_2)$
${\theta }_1$ (proportion WTP for vaccine)	0.720 (0.020)	0.699 (0.019)	0.625 (0.020)
${\theta }_2$ (proportion willing to get vaccinated if paid)	0.161 (0.017)	0.145 (0.014)	0.180 (0.017)
$(1-{\theta }_1{-\theta }_2)$ (proportion willing to get vaccinated for free)	0.115 (0.014)	0.156 (0.015)	0.195 (0.017)
WTA distribution
Intercept	− 485.87 (59.40)
Standard deviation	76.72 (5.84)
Mean	− 716.17 (60.97)
Median	− 525.91 (50.44)
WTP distribution
Intercept	55.00 (23.67)
Standard deviation	22.13 (3.13)
Mean	1147.06 (50.34)
Median	813.71 (38.87)
WTA and WTP distribution $\mathrm{Pr}\left(W,\le ,w\right)$
Mean	722.78 (53.12)	705.81 (48.64)	593.96 (49.04)

Note: all standard errors (in parenthesis) calculated using 1000 bootstrapping samples. The intercept and standard deviations of the WTA and WTP distributions correspond to the mean and standard deviation of the underlying uncensored normal distributions. Mean and medians correspond to the censored normal distributions

WTA willingness to accept, WTP willingness to pay