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Minitab Cookbook
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With the analysis of covariance, we are going to investigate the effect of a continuous variable alongside a categorical response. The dataset used in this example is of the average salary paid to teachers and expenditures per pupil in the U.S.. We will look for effects on pupil expenditure by state and by average salary of teachers.
The data is available at the data and story library. Copy the data in the following link into Minitab: http://lib.stat.cmu.edu/DASL/Datafiles/EducationalSpending.html.
The following steps will use Pay as a covariate in a general linear model and reduce the model by removing terms with a p-value above 0.05:
Navigate to Stat | ANOVA | General Linear Model and select Fit General Linear Model….
In the Responses: field, enter Spend.
In the Factors: field, enter Region and in Covariates:, enter Pay.
Click on the Model… button and then highlight both Region and Pay and select the Add button next to Interactions through order...
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