Exercise 12

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					Exercise 13
Analysis of Multi-way tables




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1. Emerged drosophila are classified according to three factors: (1) pupation site (IM: in medium; AM: at
the margin of the medium; OW: on the wall of the vial; or OM: on top of the medium); (b) sex (female or
male); and (c) mortality (healthy or unhealthy). The data in the file Drosophila_emergence.txt (Sokal and
Rohlf 2000) present the observed frequencies of sex against mortality summed over pupation sites. Test
the hierarchical models and provide a table with your results in the same format as shown in class (see slide
39 of the Categorical Data presentation for an example; 4 points). Test the significance of hypotheses
including three-factor interaction, two-factor interactions as conditional independence, and the marginal
independence (4 points). Using this information, interpret the biological relevance of your findings (2
points).

Due Tuesday December 7, 2010.

				
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