Assignment 2

Due Date

Friday, September 14, 2012

Data Source

The data for this assignment is quinn1.csv, the comma-delimited text file that you analyzed in Assignment 1.

Questions

1. Generate an "effects" graph for your final egg count model from Assignment 1 paralleling the example done in class. Plot all the regression parameter estimates (except the intercept) along with 95% confidence intervals. You can use either base graphics or lattice graphics (your choice).
2. Using your final egg count model from Assignment 1 obtain estimates of the "treatment" means, their standard errors, and 95% confidence intervals for the means.
3. Use the information you calculated in Question 2 to produce an interaction graph of your model like the one done in class. Place "Density" on the x-axis and show two mean profiles, one for each "Season". Add 95% confidence intervals for the means and include a legend that clearly identifies which profile corresponds to which season.

Hints

• In question 2 by "treatment" I mean the six possible combinations of Density with Season.

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