7 Regression
Learning Objectives
- Check model assumptions for valid regression inference
- Test for overall goodness of fit
- Test individual parameter estimates for linear model
- Generate and plot confidence and prediction intervals
- Evaluate the possible influence of outliers
Useful Functions
confint()
to generate confidence intervals for parameter estimatespredict()
to generate confidence and prediction intervals for new points at specific values of \(X\)DrawBand()
to draw confidence and prediction intervals on scatter plots
New packages to install
car
(for theBoxplot
function)reshape
(for data manipulation)
install.packages(c("car","reshape"))