Eeek! I can't believe it. Thanks so much!
From: r-sig-geo-boun...@r-project.org [r-sig-geo-boun...@r-project.org] on
behalf of Edzer Pebesma [edzer.pebe...@uni-muenster.de]
Sent: Sunday, December 08, 2013 2:16 PM
To: r-sig-geo@r-project.org
Subject: Re: [R-sig-Geo] another covariance matrix question
On 12/07/2013 08:18 PM, Hodgess, Erin wrote:
Hi again.
I have a question about covariance matrices (again)
Suppose we have an exponential model with c=2 and a=3.
Then for
c_{ij} = c exp(-h_{ij}/a),
when i=j,
we should have:
c_{ii} = 2 exp(0) = 2
But shouldn't c_{ii} = 1, please?
No, the covariance matrix has variances on the diagional, the
correlation matrix has 1 on the diagonal.
Thanks,
Erin
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Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Heisenbergstraße 2, 48149 Münster, Germany. Phone: +49 251
83 33081 http://ifgi.uni-muenster.de GPG key ID 0xAC227795
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