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Thanks! I may correct the values those are out side [0,1] using pmin
and pmax function (?). <br>
But I am sill not clear how I will do this. <br>
Thanks again<br>
<br>
Zia<br>
<br>
<br>
Edzer Pebesma wrote:
<blockquote cite="mid:4B0AAE98.3090506@uni-muenster.de" type="cite">
<pre wrap="">(replying to the list)
Well, if you're willing to accept the indicator kriging values as
estimates of these probabilities, you're essentially done. Of course,
the kriged values can be outside [0, 1], so you need to deal with that.
Best regards,
--
Edzer
Zia Ahmed wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Dear Edzer,
Thanks for your replay. I have done IK of water arsenic using
quantiles of the data. I want to do miss classification of my risk
that proposed by Goovaerts.
Two misclassification of risks are proposed by Goovaerts (1997) based
on ccdf model F(*u*;z_k |(n)) of Z(*u*)?Z_k .
1. The risk ?(*u*) of incorrectly classified a location u as
hazardous (false positive):
?(*u*) = Prob{Z(*u*) ?z_c |z*_L (u) > Z_c , (n)}
= F(*u*;z_c |(n))
Where z*_L (u) is the estimator.
2. The risk ?(u) wrongly classified a location u as safe (false
negative)
?(*u*) = Prob{Z(*u*) > z_c |z*_L (u) ? Z_c , (n)}
= 1- F(*u*;z_c |(n))
Ref: Goovaerts, P (1997). Geostatistics for Natural Resource
Evaluation, pp: 259-368
Zia
Edzer Pebesma wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Dear Zia,
If you mean by Goovaerts (1997) his 483 page book "Geostatistics for
Natural Resource Evaluation", then please give us a bit more precise
detail on what you want (which page? which equation?)
--
Edzer
Zia Ahmed wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi all,
Is it possible in gstat to get misclassification of risks as
hazardous (false positive) and safe (false negative) as describe by
Goovaerts (1997) from parametric or non-parametric probability
mapping?. help will appreciated.
Thanks
Zia
</pre>
</blockquote>
<pre wrap="">
</pre>
</blockquote>
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