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. Author manuscript; available in PMC: 2021 May 17.
Published in final edited form as: Int J Uncertain Quantif. 2020;10(6):515–542. doi: 10.1615/int.j.uncertaintyquantification.2020033241

TABLE 2:

Model parameters in the repressilator example. The second column presents the parameters of the prior distribution, where we use a Gaussian prior in the log10-transformed parameter space with a diagonal covariance matrix. The last four columns present the posterior mean and standard deviation of model parameters estimated using four methods: fixed-fidelity ST-MCMC (Fixed), Multifidelity ST-MCMC with ESS-Bridging, Multifidelity ST-MCMC with IT-Bridging, and Multifidelity ST-MCMC with β-tuning and IT-Bridging.

Parameter True Prior Posterior
Full-fidelity ESS-Bridge IT-Bridge Tuned IT-Bridge
log10(k0) 1.00 10.00 ± 0.3 1.00 ± 0.01 1.00 ± 0.02 0.99 ± 0.01 1.00 ± 0.01
log1o(γ0) −2.00 0.10 ± 0.3 −1.98 ± 0.07 −1.98 ± 0.08 −1.98 ± 0.07 −1.98 ± 0.07
log10(a0) −1.00 0.10 ± 0.3 −1.05 ± 0.06 −1.05 ± 0.07 −1.07 ± 0.06 −1.06 ± 0.06
log10(b0) 0.30 0.10 ± 0.3 0.31 ± 0.01 0.31 ± 0.01 0.31 ± 0.01 0.31 ± 0.01
log10(k1) 0.88 10.00 ± 0.3 0.87 ± 0.00 0.87 ± 0.01 0.87 ± 0.00 0.87 ± 0.00
log1o(γ1) −1.70 0.10 ± 0.3 −1.71 ± 0.05 −1.73 ± 0.06 −1.73 ± 0.05 −1.71 ± 0.05
log10(a1) −2.00 0.10 ± 0.3 −1.98 ± 0.05 −1.98 ± 0.06 −1.99 ± 0.05 −1.98 ± 0.05
log10(b1) 0.40 0.10 ± 0.3 0.40 ± 0.01 0.40 ± 0.01 0.40 ± 0.01 0.40 ± 0.01
log10(k2) 1.00 10.00 ± 0.3 0.98 ± 0.01 0.99 ± 0.01 0.98 ± 0.01 0.98 ± 0.01
log10(γ2) −1.30 0.10 ± 0.3 −1.34 ± 0.03 −1.34 ± 0.04 −1.34 ± 0.03 −1.34 ± 0.03
log10 (a2) −1.30 0.10 ± 0.3 −1.35 ± 0.06 −1.34 ± 0.07 −1.36 ± 0.06 −1.35 ± 0.06
log10 (b2) 0.48 0.10 ± 0.3 0.48 ± 0.01 0.48 ± 0.01 0.48 ± 0.01 0.48 ± 0.01