Statistics for Maintenance Modelling: Regression Modelling

# Case Study: Breaking Strengths of Carbon Fibres - Proportional Hazards Model

To test whether the proportional hazards model is appropriate we can plot the ln-ln survivor function against ln(t), as described on screen 7.

If the proportional hazards model is appropriate the plot should consist of vertically shifted copies of the same curve. Further, if these curves are in fact parallel straight lines then a Weibull model is appropriate as described on screen 10.

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