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statistique, théorie et gestion de portefeuille - Docs at ISFA

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Hill‘s estim<strong>at</strong>e b u<br />

Hill‘s estim<strong>at</strong>e b u<br />

4.5<br />

3.5<br />

2.5<br />

1.5<br />

1<br />

0.5<br />

6<br />

5<br />

4<br />

3<br />

2<br />

1<br />

0<br />

5<br />

4<br />

3<br />

2<br />

0<br />

10 −5<br />

10 −5<br />

Hill‘s estim<strong>at</strong>es of b u for DJ−daily pos.(line), n=14949, and neg.(pointwise),n=13464<br />

10 −4<br />

10 −3<br />

Lower threshold, u<br />

Hill‘s estim<strong>at</strong>es of b u for ND−5min pos.(line),n=11241, and neg.(pointwise),n=10751<br />

10 −4<br />

Lower threshold, u<br />

Figure 6: Hill estim<strong>at</strong>es ˆbu as a function of the threshold u for the Dow Jones (a) and for the Nasdaq (b).<br />

63<br />

10 −2<br />

10 −3<br />

127

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