R: quantization accuracy

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]