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statistique, théorie et gestion de portefeuille - Docs at ISFA

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224 8. Tests <strong>de</strong> copule gaussienne<br />

9<br />

8<br />

7<br />

6<br />

5<br />

4<br />

3<br />

2<br />

1<br />

0<br />

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1<br />

Figure 7: For each distance d1-d4 <strong>de</strong>fined in equ<strong>at</strong>ions (33)-(36), this figure shows the number of currency<br />

pairs th<strong>at</strong> give a given p (shown on the abscissa) within a bin interval of width 0.05 for different currencies<br />

over a 10 years time interval from January 25, 1989 to December 31, 1998. p is the probability th<strong>at</strong><br />

pairs of Gaussian random variables with the same correl<strong>at</strong>ion coefficient ρ have a distance (b<strong>et</strong>ween the<br />

distribution of z 2 and the theor<strong>et</strong>ical chi 2 distribution) equal to or larger than the corresponding distance<br />

obtained for each currency pair. A clustering close to the origin signals a significant rejection of the<br />

Gaussian copula hypothesis.<br />

32<br />

d<br />

1<br />

d<br />

2<br />

d<br />

1<br />

d<br />

4

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