Discrete-time hazard models that do not invoke the proportionality assumption (ALDA, Section 12.5.1, pp 454-456) A completely general representation: The predictor has a unique effect in each period A more parsimonious representation: The predictors effect changes linearly with time 1 assesses the effect of X 1 in time period c 2 describes how this effect linearly increases (if positive) or decreases (if negative) Another parsimonious representation: The predictors effect differs across epochs 2 assesses the additional effect of X 1 during those time periods declared to be later in time © Singer & Willett, page 20
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