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Log returns for IBM 1/3/62-11/3/00 (blue=1961-1981)

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4

Log returns for IBM 1/3/62-11/3/00 (blue=1961-1981)

1962 1967 1972 1977 1982 1987 1992 1997

time

-2 0 -1 0 0 1 0

100* lo g( retu rn s )

(37)

5

Sample ACF IBM (a) 1962-1981, (b) 1982-2000

0 10 20 30 40

Lag

0.0 0 .2 0.4 0 .6 0.8 1 .0

AC F

(a) ACF of IBM (1st half)

0 10 20 30 40

Lag

0.0 0 .2 0.4 0 .6 0.8 1 .0

AC F

(b) ACF of IBM (2nd half)

(38)

6

Sample ACF of abs values for IBM (a) 1961-1981, (b) 1982-2000

Lag

ACF

0 10 20 30 40

0.0 0 .2 0.4 0 .6 0.8 1 .0

(a) ACF, Abs Values of IBM (1st half)

Lag

ACF

0 10 20 30 40

0.0 0 .2 0.4 0 .6 0.8 1 .0

(b) ACF, Abs Values of IBM (2nd half)

(39)

7

Sample ACF of squares for IBM (a) 1961-1981, (b) 1982-2000

0 10 20 30 40

Lag

0 .0 0 .2 0 .4 0 .6 0 .8 1 .0

AC F

(a) ACF, Squares of IBM (1st half)

0 10 20 30 40

Lag

0 .0 0 .2 0 .4 0 .6 0 .8 1 .0

AC F

(b) ACF, Squares of IBM (2nd half)

(40)

8

Sample ACF of original data and squares for IBM 1962-2000

0 10 20 30 40

Lag

0 .00 .2 0 .40 .6 0 .81 .0

ACF

0 10 20 30 40

Lag

0 .00 .2 0 .40 .6 0 .8 1 .0

ACF

(41)

11

500-daily log-returns of NZ/US exchange rate

t

X( t)

0 100 200 300 400 500

-0. 0 4 -0. 02 0. 0 0 .0 2

(42)

12

ACF of X(t)=log-returns of NZ/US exchange rate

lag h

AC F

0 10 20 30 40 50

0. 0 0 .2 0. 4 0 .6 0. 8 1 .0

(43)

13

ACF of X 2 (t)

lag h

A C F (|X |^2 )

0 10 20 30 40 50

0. 0 0 .2 0. 4 0 .6 0. 8 1 .0

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