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Public Economics Lectures Part 1: Introduction

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Hazard Models<br />

Define hazard rate h t = number that find a job at time t divided by<br />

number unemployed at time t<br />

This is an estimate of the probability of finding a job at time t<br />

conditional on being unemployed for at least t weeks<br />

Standard specification of hazard model: Cox “proportional hazards”<br />

h t = α t exp(βX )<br />

Here α t is the non-parametric “baseline” hazard rate in each period t<br />

and X is a set of covariates<br />

Semi-parametric specification — allow hazards to vary freely across<br />

weeks and only identify coeffi cients off of variation across spells<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 6: Social Insurance 56 / 207

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