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statistique, théorie et gestion de portefeuille - Docs at ISFA

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10 0<br />

10 −1<br />

10 0<br />

10 −1<br />

10 −1<br />

10 −1<br />

10 0<br />

10 0<br />

IBM +<br />

IBM −<br />

Figure 16: Graph of Gaussianized IBM r<strong>et</strong>urns versus IBM r<strong>et</strong>urns, for the time interval from Jan. 1970 to<br />

Dec. 2000. The upper graph gives the positive tail and the lower one the neg<strong>at</strong>ive tail. The two straight lines<br />

represent the curves y = √ 〈c±〉<br />

x 2 〈χ±〉 and y = √ c± x 2 χ±<br />

61<br />

10 1<br />

10 1<br />

10 2<br />

10 2<br />

485

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