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"Allison has done a remarkable job in distilling a vast literature on the analysis of panel data, including continuous and categorical outcomes. For those familiar with these models, Allison provides an invaluable guide to using SAS to estimate these models. For those just beginning to use panel models, Allison provides a sophisticated yet accessible guide to understanding the key issues in the analysis of panel data. Even though the focus is on fixed effects models, the book provides detailed information on random coefficient models as well."