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Options

This page is the control by control reference for the dialog titled Residuals plots. What the finished charts show is on Residual Plots, and how each plotted quantity is formed is on Math Details.

This dialog is not one of the new chart dialogs. The other nine charts on the Charts menu open a panel inside a shared window with an Outputs tree on the left and a Create button at the bottom. Residual Plots opens the older dialog instead, the one the previous version used, so its source list, its buttons and its title all look and behave differently from the rest of the family. That is not a fault and nothing is missing: it is simply the one command that was not moved.

Three things follow, and they are worth having in mind while reading the rest of this page. The dialog is titled Residuals plots rather than beginning with the word Create. Its source picker is a dropdown rather than the Outputs tree, and it opens with one level ticked where the newer tree opens with every level of a sheet ticked. And creating is two buttons rather than one with a checkbox: the keep-open behaviour is there, as Create and don't exit, but you choose it by which button you press.

The extrapolation prompt has no place here at all, for a reason rather than an omission: this dialog holds no set point and no range, so there is no typed value that could reach outside the data.

Choosing the source

A dropdown headed Source for the plots: shows one line summarizing everything currently ticked, or (none) when nothing is ticked. Opening it shows the same three-level tree the outputs list above describes (worksheet, then output, then level), with the same rule that ticking anything on a second worksheet clears every tick on the one that had been selected. The active worksheet, when it is one of the sources the dialog offers, is inserted ahead of every other worksheet already added, so it is always first in the tree regardless of where it sits in the workbook; a worksheet added this way also carries an "(active sheet)" label. The dialog ticks one level for you when it opens: the first level under the first output of the active worksheet, or, when the active worksheet is not among the sources the dialog offers, the first available level on the first worksheet the dialog does offer instead.

The WPF dialog's Outputs tree (above) defaults the same way in one respect and differently in another. It agrees that the active sheet comes first when it is offered, falling back to the first sheet otherwise. But where this legacy dialog ticks one single level, the WPF tree instead ticks every box on that whole sheet, every output and every level of it, as the starting selection.

Residual Plots only ever plots one output at a time, and only one level of it: ticking an output in the source list on this dialog clears every output of a different type (quantitative, binary, or a level of a nominal output) that had been ticked, so the two lists above always describe the one output currently selected.

What to plot

Two lists sit side by side, Plot on X-Axis and Plot on Y-Axis. Each row is one quantity that can be plotted, with a checkbox. A checkbox in the column heading checks or clears every row in that list at once.

The rows offered depend on the type of the selected output.

For a quantitative output, the X-Axis list holds block first (when the design has blocks), then every input factor, then Run #, Actual Y, and Predicted Y. The Y-Axis list holds Actual Y, Predicted Y, Leverage, Residual, Studentized Residual, R-Studentized Residual, and Cook's D.

For a binary output, the X-Axis list holds only Predicted and Leverage. The Y-Axis list holds Delta Chi-Squared, Delta Deviance, Delta Beta, and Delta Beta Standardized.

No row starts checked; you tick the items you want plotted.

One chart is drawn for every X row and Y row that are both ticked, arranged in a grid with the ticked X items as columns and the ticked Y items as rows. If the same item is ticked on both axes, the one combination where X and Y would be the same item is skipped; every other ticked combination is still drawn.

The two lists are not the same list, and most quantities are on one axis only. Of the quantitative rows, only Actual Y and Predicted Y appear on both. The factors, block and Run # are horizontal only; Leverage, Residual, Studentized Residual, R-Studentized Residual and Cook's D are vertical only. So the grid you can build is not square, and the usual reading of it is a diagnostic quantity down the side against a factor or a fitted value along the top.

The block row is spelled lower case, as block, which is how the product writes it everywhere a factor is named. It is not one of the fixed row names: the factor rows and the block row are labelled from the design, and every other row from a fixed list.

Ticking the same item on both axes costs you one chart, not an error. The combination where the two axes would carry the same quantity is skipped and everything else is drawn.

The textual report

Create textual report is a checkbox, unchecked by default. When it is checked, a textual report is written in addition to any charts. Pressing Create with no chart items ticked and this box unchecked reports You must select at least one item for the X-Axis and at least one item for the Y-Axis. and creates nothing; checking this box on its own, with no chart items ticked at all, is enough to let Create proceed and write the textual report alone.

Creating

Four buttons sit along the bottom: Help, Close, Create and don't exit, and Create and Exit. Create and don't exit writes the chart or charts and leaves the dialog open, so another one can be created from the same or changed options without reopening it. Create and Exit writes the chart or charts and then closes the dialog. Close closes the dialog without creating anything.

See Also