. Author manuscript; available in PMC: 2017 Oct 18.

Published in final edited form as: J Am Stat Assoc. 2016 Oct 18;111(515):1075–1095. doi: 10.1080/01621459.2016.1164052

Table 2.

Summary of four models based on parametric and non-parametric specifications of the baseline hazard functions and hospital-specific random effects distributions. Hyperparameters that require specification by the analyst are provided in parenthesis. Note, (a_θ, b_θ), the hyper-parameters for the patient-specific frailty variance component, require specification in all of four models.

	Hospital-specific random effects, V_j

Baseline hazard functions, h_0g (·)	MVN (Ψ_υ, ρ_υ)	DPM^† (Ψ₀, ρ₀, τ)
Weibull (a_α,g, b_α,g, a_κ,g, b_κ,g)	Weibull-MVN	Weibull-DPM
PEM^† (α_{K_g}, a_σ,g, b_σ,g)	PEM-MVN	PEM-DPM

^†

PEM: piecewise exponential model; DPM: Dirichlet process mixture