qerror: quantization accuracy

In som: Self-Organizing Map

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 <[e-mail]>

Examples

foo <- som(matrix(rnorm(1000), 100), 2, 4)
qerror(foo, 3)

som documentation built on Sept. 18, 2024, 5:08 p.m.