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Biometrika 1985 72(1):1-9; doi:10.1093/biomet/72.1.1
© 1985 by Biometrika Trust
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Influence functions for proportional hazards regression

N. REID and H. CRÉPEAU

Department of Statistics, University of British Columbia Vancouver, British Columbia V6T 1W5, Canada

Influence functions for the regression parameters in the proportional hazards model are presented. It is suggested that empirical influence functions, computed for each observation and each covariate, can be useful in an informal way to identify influential observations. This is illustrated on the Stanford heart transplant data and two other examples.

Key Words: Censored data • Diagnostic • Influence function • Influential observation • Proportional hazards regression • Survival data


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