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Your Turn• Calculate basic summary stats for the variables.•Create a few plots to show the relationshipsbetween the variables and tip.• Are there any unusual points?•Explore the <strong>data</strong>. Find a good model to predicttips.17Your Turn• Create a new variable called tiprate•tips$tiprate

ExampleFriday Saturday Sunday Thursdayμ μ + Sat μ + Sun μ + Thur15Ancova and othermodels• Can have categorical and continuousvariables in a model.• When adding terms• a:b is the interaction between a and b• a*b gives linear terms and interaction• a*b is the same as a + b + a:b 16

Page 1 and 2: 4 - Intro to RModels and Testing1Lo
Page 3 and 4: Fitting Models• Model grammar, Fo
Page 5 and 6: Diagnostics• Residual sums of squ
Page 7: Anova• Want to test means for mul

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