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Chapter 10

Chapter 10.docx

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Mahinda Samarakoon

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Stats: Data and Models – Canadian Edition Chapter 10 – Re-Expressing Data: Get It Straight Goals of Re-Expression - Goals of re-expression help make the data more suitable for analysis by statistical methods - Goal 1: make the distribution of a variable more symmetric (making it easier to summarize) - Goal 2: make the spread of side-by-side boxplots more alike, even if centres differ (making them easier to compare) - Goal 3: make the form of a scatterplot more nearly linear (making them easier to understand) - Goal 4: make the scatter of a plot spread out more evenly rather than thickening at one end - Taking logs of the data values can make distributions more symmetric, spreads more equal, or plots more linear The Ladder of Powers - The ladder of powers orders the effects that th
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