Table 4. Bayesian estimates obtained from the modes of the posterior distributions and 95% credible intervals for parameters of gamma distributions of negative and positive mutation effects (indexed by 0 and 1, respectively), under two-sided gamma distribution models with the same or different means for negative- and positive-effect mutations.

For example, e₁ is the estimated mean of the gamma distribution of positive-effect mutations, and q₁ is their frequency.

Parameter	Model	Estimate	95% credible interval
β	Two-sided gamma, same means	0.32	0.26	0.70
e		0.0049	0.0037	0.0070
q1		0.48	0.39	0.58
β	Two-sided gamma, different means	0.30	0.24	0.71
e0		−0.0092	−0.020	−0.0060
e1		0.0021	0.0013	0.0032
q1		0.84	0.73	0.90