In the Graph Options dialog box, select the Layout tab (under Graph) to access the options described here. Use these options to modify the general layout of 2D graphs.

**Layout Settings.** Use the options under *Layout
Settings *to adjust the axis proportions, positions, and coordinate
system of the graph.

**Axis proportion.** Use the *Axis proportion
*box to set the default proportions of the axes in any 2D graph in
order to adjust the frame of reference for the graph (axes) to its shape
(i.e., in order to expose or explore a particular aspect of the data).

*Standard.*
Select *Standard* to scale the x- and y-axes independently of each
other. This option generates standard rectangular proportions.

*Equal.* Select
*Equal *to scale the x- and y-axes to the same (1:1) length (i.e.,
the proportions of the x and y sides are equal and form a regular square)

*Same Scale Units.*
Select *Same* *Scale* *Units* to generate axis proportions
based on the relative scale values on the x- and y-axes. If the x-axis
values range from 0 to 10 and the y-axis values range from 0 to 1, the
x-axis will be ten times the length of the y-axis.

*Custom.*
Select *Custom *to set the axes to any proportion you want. Enter
the relative length of the x- and y-axes in the *X *and *Y*
boxes to the right. By changing the respective values, you can "flatten"
or "stretch" the 2D box in any direction.

**Axis positions.**
Use the *Axis* *positions* box *Quick* or *Advanced*
tab) on the x- and y-axes. Select *Standard* to place the X variable
on the x-axis and the Y variable on the y-axis. Select *Reversed*
to reverse the axis positions of the X and Y variables.

**Coordinate system.** Use the *Coordinate system*
box to select a coordinate system to use with the current graph. Note
the coordinate system can be set before the graph is created using the
*Coordinate System *box on the *Graphs: More Options* dialog
(accessible from the *Options* tab of any graph specification dialog).

*Standard (Cartesian).*
Select *Standard (Cartesian)* to use standard X vs Y (Cartesian)
coordinates.

*Polar.* Select
*Polar *to convert the X-Y data to polar coordinates. Polar coordinates
(r, q) represent the
location of a point (in 2D space) by its distance (r) from a fixed point
on a fixed line (polar axis) and the angle (q,
in radians) from that fixed line. Polar plots are used to visualize functions.
They also offer an intuitive way to present relations involving a variable
representing direction.

Polar plots are automatically scaled from 0 to 2p (pi) radians and are circular in appearance with the X variable plotted around the circumference and the Y variable plotted radially. Note that the relationship between the two coordinate systems is:

X = r*cos(q)

Y = r*sin(q)

**Zoom area (in scale units). **Use the options under
*Zoom area (in scale units)* to zoom in on a specific area of the
graph (i.e., to magnify a specified area). Select the *Enable *check
box to activate the zoom area options. When this check box is selected,
the graph will be redrawn using the coordinates given in the *X, Y minimum*
and *X, Y maximum* fields here. Note that if any of these numeric
fields are left blank the actual minimum or maximum values for the graph
would be applied to the appropriate axis. Once you have used these options,
you can easily undo them by clearing the *Enable *check box or selecting
*Undo* from the *Edit* menu.

Marker point reduction. Use the Marker point reduction options to specify an optimization for rendering graphs with large amounts of data. Usually, this option does not affect the overall appearance of the graph, it simply allows for quicker display of the graph when large (i.e., more than 100,000 cases) data sets are involved. The default value is Standard, and for most data sets this is the desired setting. With this setting, every point is plotted. When two cases have the same coordinates, the second case is simply plotted over the next case. When Fast is selected, multiple points with the same coordinates are skipped (i.e., only one point with that set of coordinates would be plotted; although all cases are shown in the graph data editor). This considerably reduces the graph drawing time. The Fast option is ideal for larger data sets. The Aggressive option allows for two markers to be considered overlapping even if there is a slight (one pixel) difference between them in the graph. This option still provides a good representation of the data while drawing the graph about four times quicker.

Visual differences might exist when point labels
are used in the graph or when the markers are different (e.g., case state
markers are used).

**Histograms/ box&whisker proportions.**
These options pertain to the relative sizes of the histograms and box
& whiskers plots in Scatterplot w/Histograms and Scatterplot w/Box plots; these options are
dimmed for other types of 2D graphs where they do not apply. The proportions
that you enter here will be used to determine the relative sizes of the
histograms (or box & whisker plots) in these types of graphs. For
example, for the graph shown below, values of 50 and 10 where entered
for X and Y, respectively.

The histogram that is plotted along the X axis is as large as the scatterplot itself; the histogram plotted along the Y axis is only approximately 10% as large as the scatterplot.

**Data update.** Use the options under *Data update*
to specify the update method applied to the graph when data change in
the data file.

**Automatic.**
Select this option button to specify that the graph data is to be updated
automatically when changes are made to the data source. This will be the
default setting.

**Manual.** Select
this option button to specify that the graph data is to be updated

**Locked.** Select
this option button to specify that the graph data is not to be updated.

**Details.**
Click the *Details* button to display the *Data Update Details* dialog box, which
contains more detailed options to adjust the spreadsheet data source and
variable selection used for the graph.

**Update on OK.**
If the *Data update* mode is set to *Manual* and this check
box is selected, you can update the graph by right-clicking on the graph
background and selecting Update Now.

**Reconnect on
load.** Select a command from this drop-down list to control how the
graph reloads the data from the spreadsheet. The choices are Always,
If spreadsheet open, Always
ask, and Never.

**Update spreadsheet
case states.** When this check box is selected, the changes of the case
states (including the case labels, case excluded, case hidden, Marker
color, etc.) made in the graph will be automatically updated to the spreadsheet,
so that the spreadsheet that the current graph is based upon will have
the same case states as in the graph.

**Update Spreadsheet
on OK.** If this check box is selected, the current graph case states
will be updated in the connected spreadsheet when the dialog is closed.
If the *Update Spreadsheet Case States* check box is cleared, then
this option can be used to perform a manual update of the spreadsheet
case states.

Markers transparency. Use the interactively controlled slider to adjust the transparency of graph markers. Transparency control is a powerful graphical exploratory technique that enables users to reveal trends hidden in the dense concentrations of data points (especially scatterplots and scatterplot matrices generated from extremely large data sets). The goal is to achieve the optimal density level to uncover patterns obscured by a large number of random points (white noise) that create the "ink blot" effect. Note that Windows metafiles do not support the transparency feature. Note that this option applies to the currently displayed graph. To set the transparency for all applicable graphs, use the global Markers transparency option in the Options dialog box, Documents/Graphs: Display tab. See also the Advanced Graphics Capabilities overview.

Plot areas transparency. Use the interactively controlled slider to adjust the transparency of plot areas, e.g., histogram areas. Note that Windows metafiles do not support the transparency feature. Note that this option applies to the currently displayed graph. To set the transparency for all applicable graphs, use the global Plot areas transparency option in the Options dialog box, Documents/Graphs: Display tab. See also the Advanced Graphics Capabilities overview.

Plot areas gradient. Specify either Dark to Light or Light to Dark for the gradient areas of the plot. Note that Windows metafiles do not support the gradient feature. Note that this option applies to the currently displayed graph.