quantization accuracy
get the average distortion measure
qerror(obj, err.radius=1)
obj |
a ‘som’ object |
err.radius |
radius used calculating qerror |
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.
Jun Yan <jyan@stat.uiowa.edu>
foo <- som(matrix(rnorm(1000), 100), 2, 4) qerror(foo, 3)
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