Title: Message
I
recently attended a presentation about the mapping of soil properties. Kriging
was applied and I was wondering why a regression technique was used instead of a
classification algorithm.
Delineating soil properties seemed to be, at first sight, a
classification problem than
Hi Gregorie
Well, I think that classification could be viewed as a way of
coding of information in sampled areas. In particular for soil
properties continuos or fuzzy classification seems to work properly.
Then, avoiding to talk about the non-convexity of kriging, we can
interpolate before or
Dear
List,
I have a rather
interesting problem with my Kriged estimates for a base metal mine. I am
estimating Zn, Pb and Fe, as percentage,the sum of which should total to
no more than 100% total sulphides.
All Zn comes from
sphalerite (ZnS) at 0.671 proportion. Sphalerite SG
=3.80
All
Dear Colin:
The solution of your problem is co-kriging.
M. Rigidel has another solution: this solution and the cokriging is discussed in:
"Cas de simplification du cokrigeage" by Georges Matheron.Paris School of Mines.
Regards,
Marco
---Mensaje original---
De: Colin Badenhorst
To answer to Gregoire's question, for some comparisons between SVM and
Indicator Kriging, here is a very basic paper (from 1999):
http://baikal-bangkok.org/~nicolas/publi/acai99-svm.pdf
and a thesis chapter (chapter 6), perhaps more interesting (from 2002):
I'm also forwarding this answer from Dr Samy Bengio who hasn't
subscribed to ai-geostats. His e-mail address is available at the end of
his e-mail.
Best regards
--
Nicolas Gilardi
Particle Physics Experiment group
University of Edinburgh, JCMB
Edinburgh EH9 3JZ, United Kingdoms
tel: +44
This follow-up is slighlty aside the subject line of the mailing list, but
as a geologist, this is the only statistically-flavoured one I am
subscribed to. Therefore :
Federico Pardo [EMAIL PROTECTED] said:
Having N samples, and then n degrees of freedom.
One degree of freedom is used (or
Hi Eric
What complications! You should find, in any basic statistical inference that the correlation is divided by (n-1) and has (n-2) degrees of freedom.
The logic behind this is because the correlation is actually calculated as the covariance divided by the two standard deviations.
The
Hello list
I am a PhD student looking at developing a statistical model to predict
the size-distribution of an area's oil and gas fields.
It is clear that previous investigators prefer either a Pareto power law
or a lognormal distribution to approximate field-size distributions.
The data I
Hi
Colin,
Have you checked the Fe content of your sphalerite +
other mineralogy in the problem area?
But I guess from your statement "Thus, there is no combination of Zn, Pb and Fe in the
estimationdatabase that totals more than 100% total sulphide" you
havecalculated the total percent
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