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Residual analysis. In this chapter, we considered
Chapter , Problem 12.22(choose chapter or problem)
Residual analysis. In this chapter, we considered comparing sample standard deviations to assess the model assumption of constant variance and examining histograms of the group responses to assess the assumption of Normality. As we did in both simple linear regression (Chapter 10) and multiple linear regression (Chapter 11), we can also assess these assumptions by examining the residuals. Lets do that here for the Facebook friends study. FRIENDS (a) Fit the model and obtain the residuals. Generate a scatterplot of the residuals versus the group variable. Does it appear that the residuals are symmetrically scattered above and below 0? Are there any outliers? (b) Is the spread of the residuals in each group relatively equal? This is a visual way to assess constant variance. (c) Generate a histogram or Normal quantile plot of the residuals. Does it appear that these residuals are reasonably Normal?
Questions & Answers
QUESTION:
Residual analysis. In this chapter, we considered comparing sample standard deviations to assess the model assumption of constant variance and examining histograms of the group responses to assess the assumption of Normality. As we did in both simple linear regression (Chapter 10) and multiple linear regression (Chapter 11), we can also assess these assumptions by examining the residuals. Lets do that here for the Facebook friends study. FRIENDS (a) Fit the model and obtain the residuals. Generate a scatterplot of the residuals versus the group variable. Does it appear that the residuals are symmetrically scattered above and below 0? Are there any outliers? (b) Is the spread of the residuals in each group relatively equal? This is a visual way to assess constant variance. (c) Generate a histogram or Normal quantile plot of the residuals. Does it appear that these residuals are reasonably Normal?
ANSWER:Step 1 of 4
Given data:
Residual analysis. In this chapter, we considered comparing sample standard deviations to assess the model assumption of constant variance and examining histograms of the group responses to assess the assumption of Normality. As we did in simple linear regression (Chapter 10) and multiple linear regression (Chapter 11), we can assess these assumptions by examining the residuals. Let's do that here for the Facebook friends study. FRIENDS.