Statistics 350 Lecture 8. Today Last Day: Finish last day Today: Old Faithful, Start Chapter 3.

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Presentation transcript:

Statistics 350 Lecture 8

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

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:

Independence Model assumes that are independent Says nothing about the X i ’s…just fixed constants What is have extreme value X j ?

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

Independence