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statistique, théorie et gestion de portefeuille - Docs at ISFA

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κ<br />

22<br />

20<br />

18<br />

16<br />

14<br />

12<br />

10<br />

8<br />

6<br />

4<br />

2<br />

Excess Kurtosis for CHF / JPY<br />

0<br />

0 0.1 0.2 0.3 0.4 0.5<br />

w<br />

CHF<br />

0.6 0.7 0.8 0.9 1<br />

Figure 18: Excess kurtosis of the distribution of the price vari<strong>at</strong>ion wCHF xCHF + wJP Y xJP Y of the<br />

portfolio ma<strong>de</strong> of a fraction wCHF of Swiss franc and a fraction wJP Y = 1 − wCHF of the Japanese Yen<br />

against the US dollar, as a function of wCHF . Thick solid line : empirical curve, thin solid line : theor<strong>et</strong>ical<br />

curve, dashed line : theor<strong>et</strong>ical curve with ρ = 0 (instead of ρ = 0.43), dotted line: theor<strong>et</strong>ical curve with<br />

qCHF = 2 r<strong>at</strong>her than 1.75 and dashed-dotted line: theor<strong>et</strong>ical curve with qCHF = 1.5. The excess kurtosis<br />

has been evalu<strong>at</strong>ed for the time interval from Jan. 1971 to Oct. 1998.<br />

63<br />

487

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