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Chapter Three Day Seven

Chapter Three Day Seven. Regression Wisdom. Homework. P. 238 59,62 P. 242 63,64. Regression Wisdom. Correlation and regression describe only linear relationships Extrapolation often produces unreliable results

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Chapter Three Day Seven

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  1. Chapter ThreeDay Seven Regression Wisdom

  2. Homework • P. 238 59,62 • P. 242 63,64

  3. Regression Wisdom • Correlation and regression describe only linear relationships • Extrapolation often produces unreliable results • Correlation is not resistant – always plot your data before you interpret r. • Look for outliers and influential observations • Beware of lurking variables • Beware of correlations based on averages

  4. Influential Point

  5. Lurking Variable

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