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DYNA
versión impresa ISSN 0012-7353
Resumen
PINA-MONARREZ, Manuel R.; AVILA-CHAVEZ, Carlos A. y MARQUEZ-LUEVANO, Carlos D.. Weibull accelerated life testing analysis with several variables using multiple linear regression. Dyna rev.fac.nac.minas [online]. 2015, vol.82, n.191, pp.156-162. ISSN 0012-7353. https://doi.org/10.15446/dyna.v82n191.43533.
In Weibull accelerated life test analysis (ALT) with two or more variables , we estimated, in joint form, the parameters of the life stress model
and one shape parameter
. These were then used to extrapolate the conclusions to the operational level. However, these conclusions are biased because in the experiment design (DOE) used, each combination of the variables presents its own Weibull family
. Thus the estimated
is not representative. On the other hand, since
is determined by the variance of the logarithm of the lifetime data
, the response variance
and the correlation coefficient
, which increases when variables are added to the analysis,
is always overestimated. In this paper, the problem is statistically addressed and based on the Weibull families
a vector
is estimated and used to determine the parameters of
. Finally, based on the variance
of each level, the variance of the operational level
is estimated and used to determine the operational shape parameter
. The efficiency of the proposed method is shown by numerical applications and by comparing its results with those of the maximum likelihood method (ML).
Palabras clave : ALT analysis; Weibull analysis; multiple linear regression; experiment design.