Polar Charts

Graph > Chart > Polar

 

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The polar chart is a two-dimensional data representation drawn using linear and radial axes. In the simplest case, it charts a double {angle, radial-distance} representing the distance from the center of the chart and angle of orientation. Other variations are special cases of this intrinsic representation.

For example, points represented by {angle, radial-distance} can be connected to join lines and points connected with line and spline-interpolated for estimating missing values. Another special case allows grouping points together to make the chart show three forms of data: {group, angle, radial-distance}. The data plotted as a group can be plotted as scatter points on the radial axes, or points in the group can be joined together to form a series. These intrinsic characteristics make the polar chart effectively a scatter chart with radial mappings.

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Dialog box items

Angle: Select the column that contains angle.

Radius: Select the column that contains radius.

Grouping Variable (optional): Variable that represents groups of polar coordinates.

 

 

Data

The datasheet must contains at least two numeric columns. The radius must be positive.

 

 

Options

Data Labels:
Use to label bounds or means. After creating a chart, you can change the data labels or their attributes, or add data labels (see Editing Labels).

oNone: Choose to suppress data labels

oRadius-value Labels: Choose to label each point with its radius value

Data Options:

oExclude missing values: Check to excludes rows that have missing values.

oAngle in Degrees: Check whether the value reflects angles in degrees for Polar and Radar charts.

oShow ToolTip: Check to display messages in a ToolTip window.

 

Example

The data represents cell phone towers' signal strength in various directions by more than one carrier. This data is hypothetical and is simply an example of how the Polar chart is used. The first column represents a cellular service provider company name, followed by angular orientation and signal strength.

The data is being grouped by the chart when plotted. AT&T entries are grouped together as are the Verizon entries.

1.Open the DataBook summary.vstz

2.Select the sheet CellPhone

3.Choose the tab Graph, and then the group Chart, which displays a collection of gallery of items

4.Select Polar and then use tool-tip to select Polar Chart Using Lines and Symbols.
All available command is displayed in the gallery of graphics

5.Select group Data

6.In Angle, select Angle

7.In Radius, select Strength.

8.In Grouping Variable (optional), select Company.

9.Click Finish

 

 

Chart window output

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