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Exercise

Prediction and prediction errors

The function abline() plots a line based on its slope and intercept. This line can be used to predict y at any value of x.

When predictions are made for values of x that are beyond the range of the observed data, it is referred to as extrapolation and is not usually recommended. However, predictions made within the range of the data are more reliable. They're also used to compute the residuals.

Tip: abline() takes the slope and intercept as arguments. Here, we use a shortcut by providing the model itself, which contains both parameter estimates: abline(m1)

Note: Due to technical limitations, the dynamic appending of graphs such as adding lines is not possible in the console, only in the editor.

Instructions

100 XP
  • Create a scatterplot with runs and at_bats.
  • Place the least squares line laid on top with the help of abline().