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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 />

MRK−GE<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 12: Cumul<strong>at</strong>ive distribution of z 2 = y t V −1 y versus the cumul<strong>at</strong>ive distribution of the chi-square<br />

χ 2 with two <strong>de</strong>grees of freedom for the couple Merk / General Electric, for the time interval from Jan. 1970<br />

to Dec. 2000. This χ 2 should not be confused with the characteristic scale used in the <strong>de</strong>finition of the<br />

modified Weibull distributions.<br />

57<br />

481

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