TopoS {klaR} | R Documentation |
Computation of criterion S of a visualization
Description
TopoS
computes one version of the criterion stress
as i.e.
known from sammon
for a given visualization.
Usage
TopoS(EV.dist, Cells.dist)
Arguments
EV.dist |
a symmetric distance matrix consisting of distances in the origin space ( |
Cells.dist |
a symmetric distance matrix consisting of distances in the target space ( |
Details
TopoS first performs a homogeneous linear regression where dx
is predicted by dy
.
Then the residual sum of squares of this regression is computed and divided by the sum of squared dx
.
Finally one minus the square root of the latter result defines S
.
Value
TopoS
returns a numeric between zero and one which is the criterion S
of the given visualization.
Author(s)
Nils Raabe
See Also
Examples
# Compute S for the MDS visualization of the german business data
data(B3)
plot(cmdscale(dist(B3[, 2:14])), col = rainbow(4)[B3[, 1]], pch = 16)
TopoS(dist(B3[, 2:14]), dist(cmdscale(dist(B3[, 2:14]))))
[Package klaR version 1.7-3 Index]