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Time Series Analysis: Forecasting and Control, Fourth Edition
book

Time Series Analysis: Forecasting and Control, Fourth Edition

by George E. P. Box, Gregory C. Reinsel, Gwilym M. Jenkins
June 2008
Intermediate to advanced
770 pages
21h 9m
English
Wiley
Content preview from Time Series Analysis: Forecasting and Control, Fourth Edition

PART SIX

Exercises and Problems

This part of the book is a collection of exercises and problems for the separate chapters. We hope that these will further enhance the value of the book when used as a course text and also assist private study. A number of examples point to extensions of the ideas and act as a first introduction to additional methods.

CHAPTER 2

2.1 The following are temperature measurements zt made every minute on a chemical reactor:

200, 202, 208, 204, 204, 207, 207, 204, 202, 199, 201, 198, 200, 202, 203, 205, 207, 211, 204, 206, 203, 203, 201, 198, 200, 206, 207, 206, 200, 203, 203, 200, 200, 195, 202, 204.

  • (a) Plot the time series.
  • (b) Plot zt+1 versus zt.
  • (c) Plot zt+2 versus zt.

After inspecting the graphs, do you think that the series is autocorrelated?

2.2. State whether or not a stationary stochastic process can have the following values of autocorrelations:

  • (a) ρ1 = 0.80, ρ2 = 0.55, ρk = 0 for k > 2
  • (b) ρ1 = 0.80, ρ2 = 0.28, ρk = 0 for k > 2

2.3. Two stationary stochastic processes z1t and z2t have the following autocovariance functions:

image

Calculate the autocovariance function of the process z3t = z1t + 2z2t and verify that it is a valid stationary process.

2.4. Calculate c0, c1 c2, c3, r1, r2, r3 for the series given in Exercise 2.1. Make a graph of rk, k = 0, 1, 2, 3.

2.5. On the supposition that ρj = 0 for j > 2,

(a) Obtain approximate standard ...

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Publisher Resources

ISBN: 9780470272848Purchase book