Description Usage Arguments Details Value Author(s) References Examples
The function calculates a non-parametric concentration ellipse for a set of two-dimensional points.
1 | ConcEllipse(data, confidence=1, npoints=100)
|
data |
The set of two-dimensional points |
confidence |
Percentage of points to be included in the ellipse |
npoints |
Number of points to draw the eelipse contour. The hier the number of points the smouther is the ellipse. |
The procedre uses the Mahalanobis distances to determine the points that will be used for the calculations.
A list with the following fields
data |
Data Used for the calculations |
confidence |
The confidence level used |
ellipse |
The points on the ellipse contour to be plotted |
center |
The center of the points |
Jose Luis Vicente Villardon
Meulman, J. J., & Heiser, W. J. (1983). The display of bootstrap solutions in multidimensional scaling. Murray Hill, NJ: Bell Laboratories.
Linting, M., Meulman, J. J., Groenen, P. J., & Van der Kooij, A. J. (2007). Stability of nonlinear principal components analysis: An empirical study using the balanced bootstrap. Psychological Methods, 12(3), 359.
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