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Estimating True Changes when Categorical Panel Data are Affected by Uncorrelated and Correlated Classification Errors

An Application to Unemployment Data

University of Padova

JACQUES A. HAGENAARS

Tilburg University

MARCEL A. CROON

Tilburg University

JEROEN K. VERMUNT

Tilburg University

Conclusions about changes in categorical characteristics based on observed panel data can be incorrect when (even a small amount of) measurement error is present. Random measurement errors, referred to as independent classification errors, usually lead to over-estimation of the total amount of gross change, whereas systematic, correlated errors usually cause underestimation of the transitions. Furthermore, the patterns of true change may be seriously distorted by independent or systematic classification errors. Latent class models and directed log-linear analysis are excellent tools to correct for both independent and correlated measurement errors. An extensive example on labor market states taken from the Survey of Income and Program Participation panel is presented.

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