General Log-Linear (GLL)-Weibull Model

This example compares the results for the GLL relationship for Weibull distribution.

The data set is from Example 7.14 on page 297 in book Life Cycle Reliability Engineering by Dr. Guangbin Yang, John Wiley & Sons, 2007.

The data is given below.

The model used in the book is:


 * $$\,\!ln\left ( \eta \right )=\alpha _{0}+\alpha _{1}\frac{1}{T}$$

The book has the following results:


 * The model parameters are: $$\,\!\alpha _{0}=-3.156$$, $$\,\!\alpha _{1}=4390$$ and $$\,\!\beta =2.27$$.


 * The variance of each parameter is: $$\,\!Var\left ( \alpha _{0} \right )=3.08$$, $$\,\!Var\left ( \alpha _{1} \right )=484819.5$$ and $$\,\!Var\left ( \beta\right )=0.1396$$.


 * The two-sided 90% confidence intervals for the model parameters are: $$\,\!\left [ \alpha _{0,L},\alpha _{0,U}  \right ]=\left [ -6.044, -0.269 \right ]$$ , $$\,\!\left [ \alpha _{1,L},\alpha _{1,U}  \right ]=\left [ 3244.8, 5535.3 \right ]$$ and $$\,\!\left [ \beta _{1,L},\beta _{1,U}  \right ]=\left [ 1.73, 2.97 \right ]$$.


 * The estimated B10 life at temperature of 35°C is 24,286 hours. The two-sided 90% confidence interval is [10371, 56867].


 * The estimated reliability at 35°C and 10,000 hours is $$\,\!R\left ( 10000 \right )=0.9860$$ . The two-sided 90% confidence interval is [0.892, 0.998].

In ALTA, the GLL model with Weibull distribution is used. Since temperature is the stress, the reciprocal transform is used. The results are:
 * The model parameters are:




 * The variances of the parameters are:




 * The two-sided 90% confidence intervals for the model parameters are:




 * The estimated B10 life and its two-sided 90% confidence intervals are:




 * The estimated reliability with its two-sided 90% confidence interval at 35°C and 10,000 hours are: