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statistique, théorie et gestion de portefeuille - Docs at ISFA

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Z 2<br />

1<br />

0.9<br />

0.8<br />

0.7<br />

0.6<br />

0.5<br />

0.4<br />

0.3<br />

0.2<br />

0.1<br />

CHF−UKP<br />

0<br />

0 0.1 0.2 0.3 0.4 0.5<br />

χ<br />

0.6 0.7 0.8 0.9 1<br />

2<br />

Figure 10: Cumul<strong>at</strong>ive distribution of z 2 = y t V −1 y versus the cumul<strong>at</strong>ive distribution of chi-square (<strong>de</strong>noted<br />

χ 2 ) with two <strong>de</strong>grees of freedom for the couple Swiss Franc / British Pound, for the time interval from<br />

Jan. 1971 to Oct. 1998. This χ 2 should not be confused with the characteristic scale used in the <strong>de</strong>finition<br />

of the modified Weibull distributions.<br />

55<br />

479

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