Statistics for Maintenance Modelling: Regression Modelling

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

The proportional odds model may be tested by plotting the log odds against ln(t) as described on screen 9.

These four curves are supposed, if indeed the proportional odds model is appropriate, to be vertically shifted copies of the same curve. This is not the case, for example, the curves for lengths 1mm and 10mm appear to be concave and convex respectively.

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