L15handout - PUBH 7430 Lecture 15 J. Wolfson Division of...

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Unformatted text preview: PUBH 7430 Lecture 15 J. Wolfson Division of Biostatistics University of Minnesota School of Public Health October 25, 2011 Random/mixed effects/conditional models Motivating example Animal Behavior • Lonsdorf et al.(2004) Nature 428: 715-716 • Objective: Study the learning of termite fishing by young chimpanzees Motivating example • Design: Video-taped focal follows of chimpanzee mothers in 15 min increments over four field seasons in Gombe National Park, Tanzania • Outcome: Age at which termite fishing skill has been acquired by the mother’s offspring • Predictors: Sex of offspring • Question of interest: Did females learn termite fishing more quickly than males? Yes. Motivating example • Data are correlated: ≥ 1 offspring from each of several chimpanzee mothers • Within-cluster effect is of primary interest: Offspring from same mother of different sexes • “Cluster effects” may be heterogeneous: Some mothers termite fish more skillfully than others; offspring of these mothers might acquire skill at an earlier age...
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This note was uploaded on 11/21/2011 for the course PUBH 7430 taught by Professor Prof.eberly during the Fall '04 term at Minnesota.

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L15handout - PUBH 7430 Lecture 15 J. Wolfson Division of...

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