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Artificial Intelligence and Soft Computing: Behavioral ... - Arteimi.info

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B<br />

E<br />

A= test ?, B = test results, C = drill ?, D = profit ?,<br />

E= seismic structure, F= amount of oil ? , G = cost of drilling.<br />

Fig. 20.1: An influence diagram for testing significance of oil exploration.<br />

i) d (W1, W2) = 0, iff W1 = W2 (reflexive) (20.2)<br />

ii) d (W1, W2) = d (W2, W1) (symmetric) (20.3)<br />

iii) d (W1, W2) ≤ d (W1, W3) + d (W3 , W2) (triangle inequality)<br />

Bank <strong>and</strong> Carley [1] defined the following probability measure:<br />

(20.4)<br />

P(w) = c(s) exp (-s . d(w, W)), for each matrix w in W, (20.5)<br />

where s is a dispersion parameter <strong>and</strong> c(s) is a normalizing constant.<br />

Given the above expression, we can determine W * <strong>and</strong> s * , the estimate of W<br />

<strong>and</strong> s respectively, by means of classical likelihood techniques. For a sample<br />

A<br />

C D<br />

F<br />

G

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