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Public Economics Lectures Part 1: Introduction

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Econometric Problem 2: Measurement Error/Division Bias<br />

Wage w is typically not observed; backed out from dividing earnings<br />

by reported hours<br />

When hours are measured with noise, this can lead to “division bias”<br />

Let l ∗ denote true hours, l observed hours<br />

Compute w = e l<br />

where e is earnings<br />

⇒ log l = log l ∗ + µ<br />

⇒ log w = log e − log l = log e − log l ∗ − µ = log w ∗ − µ<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> ()<strong>Part</strong> 5: Income Taxation and Labor Supply 10 / 217

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