... | ... | @@ -71,9 +71,10 @@ In data analysis, this fallacy occurs when researchers fit multiple models or te |
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Adjusted R² is an alternative to R² that adjusts for the number of predictors in the model. Unlike R², which increases whenever a new predictor is added (even if it doesn’t improve the model), adjusted R² only increases if the new predictor improves the model more than would be expected by chance.
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\[
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$$
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\text{Adjusted R²} = 1 - \left( \frac{(1 - R²)(n - 1)}{n - p - 1} \right)
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\]
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$$
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Where:
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- **n** is the number of observations.
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