Jul
The nugget effect is the (semi) variance between two
samples which might be taken at almost exactly the
same spot. Or, expressed otherwise, the variance of
replicated samples.
The total sill is the variance of values within your
data set (or, more strictly, within all possible
samples).
Thus the nugget to not-nugget ratio is the proportion
of the variation you can expect to predict with a
spatial model, whilst the nugget part is that
variation you cannot predict no matter how closely you
sample.
Isobel
http://geoecosse.bizland.com/books.htm
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