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Chapter 10

Chapter 10. Re-expression Day 1. What does a “Good” residual plot look like? What does it mean?. Goals of Re-Expression. Make the distribution more symmetric Make the spread of several groups more alike Make the form nearly linear Make the scatter more evenly spread. Steps to Follow.

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Chapter 10

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  1. Chapter 10 Re-expression Day 1

  2. What does a “Good” residual plot look like?What does it mean?

  3. Goals of Re-Expression • Make the distribution more symmetric • Make the spread of several groups more alike • Make the form nearly linear • Make the scatter more evenly spread

  4. Steps to Follow • Do the linear model first (scatterplot, r, r-squared, LSRL, resid plot) • Mechanics-try re-expression(Ladder of Powers) (p.227 from book) • Now find a new model by least squares(this can be used for predictions)-include scatterplot, r, r-squared, LSRL, resid plot • Conclusion in context

  5. Warning • Don’t expect to be able to straighten every curved scatter plot you find. • Re-expression cannot straighten those that go up and then down, or down and then up. Refuse to analyze such data using a linear form.

  6. Homework Take Notes over Ch.10 Open Note Reading Quiz Tomorrow first thing!

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