# Minitab Help 6: MLR Model Evaluation

Minitab Help 6: MLR Model Evaluation

## Heart attacks in rabbits

• Perform a linear regression analysis of Infarc on Area, X2 (early cooling), and X3 (late cooling).
• Click "Storage" in the regression dialog and check "Fits" to store the fitted (predicted) values.
• To create a scatterplot of the data with points marked by group and three lines representing the fitted regression equation for each group:
• Select Calc > Calculator, type "FITS_1" in the "Store result in variable" box, and type "IF('Group'=1,'FITS')" in the "Expression" box. Repeat for FITS_2 (Group 2) and FITS_3 (Group 3).
• Create a basic scatter plot but select "With Groups" instead of "Simple." Select Infarc as the "Y variable," Area as the "X variable," and Group as the "Categorical variable for grouping."
• Select Editor > Add > Calculated Line and select "FITS_1" to go into the "Y column" and "Area" to go into the "X column." Repeat for FITS_2 (Group 2) and FITS_3 (Group 3).

## Student heights and GPAs

• Perform a linear regression analysis of GPA on height.
• Create a fitted line plot to create a scatterplot of the data with a fitted simple linear regression line. Select Editor > Add > Reference Lines to add a horizontal line at the mean of GPA.
• SSE for the full model is in the SSE row of the Anova table.
• SSE for the reduced model is in the Total row of the Anova table.
• The overall F statistic and p-value are in the Regression row of the Anova table.

## Skin cancer mortality

• Perform a linear regression analysis of Mort on Lat.
• Create a fitted line plot to create a scatterplot of the data with a fitted simple linear regression line. Select Editor > Add > Reference Lines to add a horizontal line at the mean of Mort.
• SSE for the full model is in the SSE row of the Anova table.
• SSE for the reduced model is in the Total row of the Anova table.
• The overall F statistic and p-value are in the Regression row of the Anova table.

## Alcoholism and muscle strength

• Perform a linear regression analysis of the strength of alcohol.
• SSE for the full model is in the SSE row of the Anova table.
• SSE for the reduced model is in the Total row of the Anova table.
• The overall F statistic and p-value are in the Regression row of the Anova table.

## Allen cognitive level study

• Perform a linear regression analysis of ACL on:
• Vocab (with default adjusted sums of squares).
• Vocab and SDMT (with adjusted sums of squares).
• Vocab and SDMT (click "Options" to switch to sequential sums of squares).
• SDMT (click "Options" to switch back to adjusted sums of squares).
• SDMT and Vocab (with adjusted sums of squares).
• SDMT and Vocab (click "Options" to switch to sequential sums of squares).
• SDMT, Vocab, and Abstract (with sequential sums of squares).

## Heart attacks in rabbits (revisited)

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