11H6:
The data in data(Primates301) are 301 primate species and associated measures. In this problem, you will consider how brain size is associated with social learning. There are three parts.
(a) Model the number of observations of social_learning for each species as a function of the log brain size. Use a Poisson distribution for the social_learning outcome variable. Interpret the resulting posterior.
(b) Some species are studied much more than others. So the number of reported instances of social_learning could be a product of research effort. Use the research_effort variable, specifically its logarithm, as an additional predictor variable. Interpret the coefficient for log research_effort. How does this model differ from the previous one?
(c) Draw a DAG to represent how you think the variables social_learning, brain, and research_effort interact. Justify the DAG with the measured associations in the two models above (and any other models you used).
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Stone's book on Information: shorturl.at/aqwNS
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