# 9.3.7.39 The (Plot Details) Centroid Tab(Pro Only)

This tab is used to calculate the centroid points for subsets, add connection lines between data points and their centroid, add error bars for centroid points and add confidence ellipses for each subset.

If no subset has been set in Subset tab, the whole Y column of current plot will be treated as one set to calculate the centroid point.

### Show Centroid Point for Subset

Check Show Centroid Point for Subset to calculate and draw the centroid point for each subset.

#### Customize the Centroid Points

Customize the style of the centroid points, including Shape, Color, Size and Transparency.

#### Show Error Bar for Centroid Points

Add X and Y error bar for the centroid points. Here, Origin supports Standard Error, Standard Deviation or Standard Interval as X and Y error bar of centroid points.

You can customize the style of error bars, including the Cap Width.

#### Connect the Centroid Point to the Data Points

Once the centroid points have been drawn, you can decide whether connect the data points in the subset and their centroid point. You can customize the style of connect lines.

### Show Label

Specify whether show labels for the centroid points. By default, the grouping values will show as labels if you check Show Label check box. You are also allowed to specify another column to label the centroid points.

You can customize the font and the position of the labels.

### Show Ellipse

Specify whether show ellipses for the centroid points. Three types of ellipse are supported here:

• Convex Hull: draw a concave hull around the data points
• Confidence Level(Mean): same as confidence ellipse of mean for linear regression, just like what the 2D Confidence Ellipse app does.
• Confidence Level(Prediction): same as confidence ellipse of prediction for linear regression, just like what the 2D Confidence Ellipse app does.
• Euclidean Distance: draw a circle with the radius equal to the number set after Ellipse. It is the most common distance measure, is the geometric distance in multidimensional space.

You can specify the confidence level for the ellipses, from 0~100. Or, enter the radius value for Euclidean Distance.

And, you can customize the line style and the Fill Color of the ellipses.
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