Deviance residuals versus event probability for Probit Analysis

Use the Deviance residuals versus event probabilities plot to assess the appropriateness of the fitted probit model. Any unusual pattern or trend in the deviance residual plot indicates that the fitted probit model may be inappropriate.

Note that the deviance residuals account for the binomial response variable. Because the response variable follows a binomial distribution, the variability is usually highest at stress levels where approximately 50% of the units fail. Ordinary residuals, like those used in regression and ANOVA, do not account for the non-constant variance due to the binomial response variable.

Example output

Interpretation

For the windshield data, the deviance residuals do not follow any particular pattern. Therefore, the plot does not indicate any problems with the selected probit model.

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