Statistics%20350%20%20Lecture%208

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Statistics 350 Lecture 8
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Today

• Last Day Finish last day
• Today Old Faithful, Start Chapter 3

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Overview of Diagnostics

• Have assumed that the simple linear regression
  model holds
• The assumptions of this model can be violated in
  a number of ways

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Independence

• Model assumes that are
  independent
• Says nothing about the Xisjust fixed constants
• What is have extreme value Xj?

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Independence

• Exptreme point can determin where the regression
  line will go?
• If model is correct is this bad
• What often happens with extreme points?
• Good idea to use box-plot to identify extreme
  values

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Independence
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Independence
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Independence