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Calculating Frequentist R-squared

Let's practice calculating the R-squared. By starting with the frequentist R-squared, we can check our formulas for calculating the R-squared by hand, by checking against the value in the frequentist summary. The lm_model and lm_summary objects are already in your environment.

Cet exercice fait partie du cours

Bayesian Regression Modeling with rstanarm

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Instructions

  • Print the R-squared value from the lm_summary object
  • Calculate the variance of the residuals of the lm_model
  • Calculate the variance of the predicted values of the lm_model
  • Calculate the R-squared value

Exercice interactif pratique

Essayez cet exercice en complétant cet exemple de code.

# Print the R-squared from the linear model
lm_summary$___

# Calulate sums of squares
ss_res <- ___(___(lm_model))
ss_fit <- ___(___(lm_model))

# Calculate the R-squared
1 - (___ / (___ + ___))
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