Risks as hazardous (false positive) and safe (false negative)

(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:
  

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:
    

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:
 
      

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