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Residual Plots

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QXL DOE Tab > Charts > Residual Plots

Create Residual Plots from a regression model by selecting QXL DOE Tab > Charts > Residual plots.

Residual plots fall into the Regression Diagnostics class of graphical tools. The intent of these tools is to identify problems with a regression model so that the model can be improved.

Residual Plots are available for both Quantitative Data or Binary Logistic Regression.

Quantitative Residuals

Source: Choose the model (Y-hat or S-hat) from the drop down box.

Plot on X Axis: Choose the desired item(s) for the X Axis. Multiple selections are allowed. Options include each individual input, Run #, Actual Y, and Predicted Y.

Plot on Y Axis: Choose the desired item(s) for the Y Axis. Multiple selections are allowed. Options include Actual Y, Predicted Y, Leverage, Residual, Studentized Residual, R-Studentized Residual, and Cook's D.

For more information on residuals, see the topic Understanding Least Square Residuals.

Optionally, check the box "Create texture report" to have Quantum XL create a spreadsheet with the residual values in addition to the charts.

Binomial Logistic Residuals

Source: Choose a binary logistic regression table.

Plot on X-Axis: Choose the desired item(s) for the X Axis. Options include Predicted values and leverage.

Plot on Y-Axis: Choose the desired item(s) for the Y Axis. Options include Delta Chi-Squared, Delta Deviance, Delta Beta, and Delta Beta Standardized.

For more information on Binomial residuals, see the help topic Understanding Binomial Logistic residuals.