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Bias and Variance of Slope and Intercept

Bias and Variance of Slope and Intercept. Slope: Intercept:. Variance Formulae. Error sum of squares: Can show that Therefore is unbiased. Variance Formulae. Another formula for where . Estimated Standard Errors (definitions). Slope: Intercept:. Use of Regression.

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Bias and Variance of Slope and Intercept

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  1. Bias and Variance of Slope and Intercept • Slope: • Intercept:

  2. Variance Formulae • Error sum of squares: • Can show that • Therefore is unbiased

  3. Variance Formulae • Another formula for • where

  4. Estimated Standard Errors (definitions) • Slope: • Intercept:

  5. Use of Regression • Care should be taken in: • selecting variables (strong observed correlation does not always imply a causal relationship) • extrapolating beyond the original range of the regressor x

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