computeScaleCurve: Computation and Representation of the Scale Curve

In RcmdrPlugin.depthTools: R Commander Depth Tools Plug-in

Description

computeScaleCurve computes the scale curve of a given group, based on the MBD, at a given value p as the area of the band delimited by the [np] most central observations, where [np] is the largest integer smaller than np.

Details

The scale curve measures the increase in the area of the band determined by the fraction p most central curves, where p moves from 0 to 1, thus providing a measure of the sample dispersion. If the data set is represented in parallel coordinates, then the area is computed using the trapezoid formula.

Value

computeScaleCurve plots the scale curve of the active data set, which can contain a single group or several. In the latter case, a vector of labels can be provided to compute the scale curve for each group. The Y-coordinates used in the plot, i.e., the scale curve values at each point p can be stored as a vector, if only one group is present, or as a list, if there are several groups.

Author(s)

Sara Lopez-Pintado [e-mail] and

Aurora Torrente [e-mail]

References

Lopez-Pintado, S. et al. (2010). Robust depth-based tools for the analysis of gene expression data. Biostatistics, 11 (2), 254-264.

See Also

computeMBD

RcmdrPlugin.depthTools documentation built on Oct. 23, 2020, 5:49 p.m.