Creating Residual Plots in Minitab - University of Kentucky
Checking Error Assumptions in Minitab
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It is a good idea to store standardized residuals in the data worksheet
Stat ( Regression ( Regression
In regression dialogue box, click Storage.
Check Standardized Residuals under Diagnostic Measures
Checking for randomness and constant variance
To produce a scatterplot of the standardized residuals against the fitted values:
Stat ( Regression ( Regression
Click Graphs and check the box next to Residuals versus fits
To produce a scatterplot of the standardized residuals against each of the independent variables:
Stat ( Regression ( Regression
Under Residuals versus the variables, enter each of the independent variables
Checking for normality
To produce graphs as part of the regression analysis:
Stat ( Regression ( Regression
Click Graphs and check the boxes next to Histogram of Residuals and Normal Plot of Residuals
To see an idealized normal density plot overtop of the histogram of residuals:
Make sure you have stored the standardized residuals in the data worksheet (see above.)
Graph ( Histogram ( With Fit ( OK.
Under Graph variables, select the column in which the residuals were stored (something like SRES1), then click OK.
To create a stem and leaf plot
Make sure you have stored the standardized residuals in the data worksheet (see above.)
Graph ( Histogram ( With Fit ( OK.
Under Graph variables, select the column in which the residuals were stored (something like SRES1), then click OK.
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