| qerror {som} | R Documentation |
quantization accuracy
Description
get the average distortion measure
Usage
qerror(obj, err.radius=1)
Arguments
obj |
a ‘som’ object |
err.radius |
radius used calculating qerror |
Value
An average of the following quantity (weighted distance measure) over all x in the sample,
\sum ||x - m_i|| h_{ci}
where h_{ci} is the neighbourhood kernel for the ith code.
Author(s)
Jun Yan <jyan@stat.uiowa.edu>
Examples
foo <- som(matrix(rnorm(1000), 100), 2, 4)
qerror(foo, 3)
[Package som version 0.3-5.1 Index]