Estimation in a Cox regression model with a change-point according to a threshold in a covariate

By O. Pons. 2003

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Testing for Threshold Effects in Regression Models (2010, background): “KEY WORDS: Davies problem; Empirical process; Maximum rank correlation estimation; Maximum score estimation; U-process.”
FURTHER DETAILS ON INFERENCE UNDER RIGHT CENSORING FOR TRANSFORMATION MODELS WITH A CHANGE-POINT BASED ON A COVARIATE THRESHOLD (2006, methodology): “We note that for the special case when α = 0 and Λ(t) = e−t, the model (3) becomes the Cox model considered by [27] under a slightly different parameterization.”