Scatterplot
Last updated
Last updated
A Scatterplot shows the combination of values from two fields mapped as Cartesian coordinates. They may be continuous (a number) or categorical (a name), although 2 continuous fields works best (use a Multiscape to view the aggregated interactions of 2 categorical fields). Learn about each Scatterplot feature below:
Glyph Style: shape drawn for a point.
The shape drawn for a Scatterplot point may be determined by the data value in another field. A fixed set of shapes are used, and these are automatically assigned to your data--you cannot control the mapping. Styles are best mapped to a categorical field (string or integer) with a small number of values, since shapes are best for distinguishing things with no implied ordering.
Glyph styles are: filled circle, filled square, filled diamond, filled triangle, open circle, open square, open diamond, open triangle.
From: Chart Toolbar "Configure Data".
Glyph Size: glyph size may be based on data.
The sizes of points in the Scatterplot may be proportional to values from another numeric field.
From: Chart Toolbar "Configure Data".
Point Size: control the overall scale of points.
The sizes of all points can be scaled up or down from the Advanced Properties pane. This is a multiplier that affects large points more.
This can also be changed from the keyboard with the "+" and "-" keys.
From: Advanced Property "Point Size"; Keyboard "+", "-".
Selected Point Size: distinguish selected items by a size increment.
Selected points are drawn slightly larger than Unselected points by default to make them more prominent. You can choose how much larger selected points are.
From: Advanced Property "Highlighted Item Size".
Transform Axes: spread out bunched-up data points.
If the data in the X and/or Y fields is skewed toward the origin and trails off with a large range of values, it may be better viewed with a log or root transform. The default is a linear mapping of values to each axis.
From: Advanced Properties "X Transformation", "Y Transformation".
Trend Line: draw a line showing the data trend.
A Trend Line shows the relationship between the data points. Two calculated Trend Lines are available, linear or local. There are also options that connect data points in various ways (see "As a line chart" below). The linear trend is a straight line calculated using simple linear regression. The local Trend Line bends somewhat to more closely follow the data values.
Separate Trend Lines are drawn for the overall population and the currently selected subset, allowing you to see how the subset compares to the overall. Select some portions of the chart to see this.
From: Chart Toolbar "Display Trend Line"; Advanced Properties "Trend Line Mode", "Trend Line Slope", "Trend Line Intercept", "Trend Line Correlation Coefficient (R-Squared)".
Jitter: moving points to reduce over plotting.
Since points in a Scatterplot are drawn based on their X and Y coordinates, multiple points may be mapped to the same point on the screen. To better reveal such over plotting, jittering adds a small random amount to the location of each point. You can jitter in just the X or Y direction, or in both.
Points are also drawn in order of color, from colder colors (e.g., blues in the Spectrum scale) to hotter colors (e.g., reds in the Spectrum scale). This ensures visibility of the "most important" data.
From: Chart Toolbar "Jitter Points"; Advanced Properties "X Jitter", "Y Jitter".
Viewpoint: zoom into a portion of the display.
You can manipulate your viewpoint on the display by zooming and panning. This can be done with the mouse, Zoombars, and the keyboard.
The side and bottom Zoombars change the viewpoint and also show where you currently are. Drag either end of a Zoombar to zoom; drag the whole bar to pan. Click the "Home" icon in the lower right corner to return to the original viewpoint, or use the "Home" key.
Drag the mouse with the Middle Button (scroll wheel) depressed to pan; drag up and down with the Middle Mouse Button while holding the CTRL key to zoom.
Zooming by default is linked between the X and Y axes, or each Zoombar may be operated independently if the "Linked Scaling" property is turned off.
From: Zoombars; Mouse, Keyboard; Advanced Property "Linked Scaling".
Show Unselected: are Unselected items drawn?
Drawing of glyphs for Unselected rows is controlled by the "Show Unselected" property.
From: Chart Toolbar "Display Unselected Data"; Advanced Property "Show Unselected".
Locate: where am I?
The coordinates of the mouse are constantly shown on the X and Y axes. Move the mouse over the chart to see this.
Customizable Focus: what is this item?
You focus on an item by pointing at it for a second (or labeling is done immediately if SHIFT or CTRL is depressed, or the "Label By Hover" property is set). By default, the X and Y axis values for the point are shown. Focus is propagated to other views as well.
From: Advanced Properties "Label By Hover", "Focus Format String".
Title and labels: manage text.
You can select the font to use for axis text and titles, set the labels for each axis, and set a title and control whether the title is visible.
From: Chart Toolbar "Edit Chart titles..."; Advanced Properties "Axis Font", "Display Title", "Label Font", "Title", "X Axis Text", "Y Axis Text".
As a Line Chart: use as non-aggregated Line Chart.
The ADVIZOR Line Chart aggregates categories on the X axis, but this may not always be the behavior you want. You may find the Scatterplot a useful alternative by using a Trend Line option such as "Maximum", "Minimum", or "Average" to form a line between adjacent X axis locations--for instance, if your X field is an Integer or String value.
From: Chart Toolbar "Display Trend Line"
See also:
For linear Trend Lines, the parameters of the Trend Line are available in the for the chart. These include the Slope and Intercept for the Trend Line. The Correlation Coefficient (R2) is also provided: this is a number from 0 to 1 that shows how closely the data fits the Trend Line. These parameters apply to the overall population only. If you would like to see these for the currently Selected subset of the population, exclude the Unselected items to make the Selected set the entire population.
You can customize the focus information by editing the property. Clearing this string suppresses focus labeling.
