# Regression - Diagnostic - Plot - Scale-Location extension

Create a plot of the square root of the absolute standardized residuals by fitted values

A chart of the square root of the absolute standardized residuals by fitted values. Also known as a Spread-Location or S-L plot.

## Example

The following example shows the output from running this QScript on a Regression - Poisson RegressionPoisson regression output.

## Acknowledgements

Uses the plot.lm or plot.glm functions from the stats R package.

## References

Belsley, D. A., Kuh, E. and Welsch, R. E. (1980). Regression Diagnostics. New York, NY: Wiley.

## Code

includeWeb("QScript R Output Functions");

const menu_location = "Regression > Diagnostic > Plot > Scale-Location";