If an experimental semi-variogram appears to show a linear or
power form (i.e. it doesn't reach a sill) what does this indicate
about the phenomenom under investigation? Does it indicate a trend?
If so would it be more appropriate to use universal kriging rather
than fitting a linear model and doing ordinary kriging?
National Radiological Protection Board
Didcot, Chilton, Oxon, OX11 0RQ, UK.
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