Change Comes with Time: Substantive Interpretation of Nonproportional Hazards in Event History Analysis

Amanda A. Licht

Political Analysis, 2011, vol. 19, issue 2, 227-243

Abstract: Although methodologists have provided us ample notice of both the problem of nonproportional hazards (NPHs) and the means of correcting for them, less attention has been paid to the postestimation interpretation. The suggested inclusion of time interactions in our models is more than a statistical fix: These corrections alter the substantive meaning and interpretation of results. Framing the issue as a specific case of multiplicative-interaction modeling, I provide detailed discussion of the problem of NPHs and present several appropriate means of interpreting both the substantive impact and the significance of variables whose effects may change over time.

Date: 2011
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