What is R-squared?
A statistical measure that evaluates the goodness of fit of a model
R-squared explained in plain English
Analogy
Think of R-squared like a report card for your model, where 100% would mean the model perfectly predicts the data, and 0% means it doesn't explain anything
Example
A company uses R-squared to evaluate a model that predicts sales based on advertising spend, finding that the model explains 80% of the variation in sales
How is R-squared used?
R-squared is used to evaluate the performance of regression models, helping to identify which factors are most important in predicting an outcome
Common misconceptions about R-squared
History
The concept of R-squared was first introduced by statistician Karl Pearson in the early 20th century
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