Reliability with multiple causes of failures: Modeling and practice through a case study on ultrasound probes for medical imaging | International Journal of Metrology and Quality Engineering (IJMQE)

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Table 6

Estimates and HRs by USP types for model (12)¹.

	Probe-a				Probe-b
Coef.	Estimate	Std.Err.	p-value	HR	Estimate	Std.Err.	p-value	HR
β₀	9.7148	0.2123	<0.0001	2e-5	10.2025	0.3680	<0.0001	2e-5
$β_{1}^{*}$	0.0947	0.1471	0.5196	0.9013	3.6383	0.9924	0.0002	0.0204
$β_{2}^{*}$	–0.7670	0.1274	<0.0001	2.3211	–0.5039	0.1733	0.0036	1.7143
$β_{3}^{*}$	1.0709	0.2156	<0.0001	0.3086	1.8192	0.4074	<0.0001	0.1429
$β_{4}^{*}$	0	–	–	1	0	–	–	1
σ	0.9109	0.0470	–	–	0.9349	0.0784	–	–
γ	1.0978	0.0567	–	–	1.0697	0.0897	–	–

It must be noted that, according to the usual and consolidated notation for the Weibull distribution, the used symbols σ and γ have a different meaning in comparison with that reported in Section 3.3.

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