Calculus for Business, Economics, Life Sciences, and Social Sciences (13th Edition)
13th Edition
ISBN: 9780321869838
Author: Raymond A. Barnett, Michael R. Ziegler, Karl E. Byleen
Publisher: PEARSON
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Chapter A.2, Problem 23E
In Problems 9–30, perform the indicated operations and simplify.
23.
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Module Code: MATH380202
3. (a) Let {} be a white noise process with variance σ2.
Define an ARMA(p,q) process {X} in terms of {+} and state (without proof)
conditions for {X} to be (i) weakly stationary and (ii) invertible.
Define what is meant by an ARIMA (p, d, q) process. Let {Y} be such an ARIMA(p, d, q)
process and show how it can also be represented as an ARMA process, giving the
AR and MA orders of this representation.
(b) The following tables show the first nine sample autocorrelations and partial auto-
correlations of X and Y₁ = VX+ for a series of n = 1095 observations. (Notice
that the notation in this part has no relationship with the notation in part (a) of
this question.)
Identify a model for this time series and obtain preliminary estimates for the pa-
rameters of your model.
X₁
= 15.51, s² = 317.43.
k
1
2
3
4
5
6
7
Pk
0.981
0.974
0.968
akk 0.981 0.327
8
9
0.927
0.963 0.957 0.951 0.943 0.935
0.121 0.104 0.000 0.014 -0.067 -0.068 -0.012
Y₁ = VX : y = 0.03, s² = 11.48.
k
1…
Let G be a graph with n ≥ 2 vertices x1, x2, . . . , xn, and let A be the adjacency matrixof G. Prove that if G is connected, then every entry in the matrix A^n−1 + A^nis positive.
Module Code: MATH380202
1. (a) Define the terms "strongly stationary" and "weakly stationary".
Let {X} be a stochastic process defined for all t € Z. Assuming that {X+} is
weakly stationary, define the autocorrelation function (acf) Pk, for lag k.
What conditions must a process {X+) satisfy for it to be white noise?
(b) Let N(0, 1) for t€ Z, with the {+} being mutually independent. Which of
the following processes {X+} are weakly stationary for t> 0? Briefly justify your
answers.
i. Xt for all > 0.
ii. Xo~N(0,) and X₁ = 2X+-1+ &t for t > 0.
(c) Provide an expression for estimating the autocovariance function for a sample
X1,..., X believed to be from a weakly stationary process. How is the autocor-
relation function Pk then estimated, and a correlogram (or acf plot) constructed?
(d) Consider the weakly stationary stochastic process ✗+ = + + +-1+ +-2 where
{E} is a white noise process with variance 1. Compute the population autocorre-
lation function Pk for all k = 0, 1, ....
Chapter A.2 Solutions
Calculus for Business, Economics, Life Sciences, and Social Sciences (13th Edition)
Ch. A.2 - (A)Given the polynomial 6x5 + 7x3 2, what is the...Ch. A.2 - Remove parentheses and simplify: (A)3(u2 2v2) +...Ch. A.2 - Prob. 3MPCh. A.2 - Subtract 2x2 5x + 4 from 5x2 6, both...Ch. A.2 - Multiply: (2x3)(2x2+3x2)Ch. A.2 - Prob. 6MPCh. A.2 - Perform the indicated operations and simplify:...Ch. A.2 - Prob. 1ECh. A.2 - Problems 18 refer to the following polynomials:...Ch. A.2 - Problems 18 refer to the following polynomials:...
Ch. A.2 - Problems 18 refer to the following polynomials:...Ch. A.2 - Prob. 5ECh. A.2 - Problems 18 refer to the following polynomials:...Ch. A.2 - Problems 18 refer to the following polynomials:...Ch. A.2 - Problems 18 refer to the following polynomials:...Ch. A.2 - In Problems 930, perform the indicated operations...Ch. A.2 - In Problems 930, perform the indicated operations...Ch. A.2 - In Problems 930, perform the indicated operations...Ch. A.2 - In Problems 930, perform the indicated operations...Ch. A.2 - In Problems 930, perform the indicated operations...Ch. A.2 - Prob. 14ECh. A.2 - In Problems 930, perform the indicated operations...Ch. A.2 - In Problems 930, perform the indicated operations...Ch. A.2 - In Problems 930, perform the indicated operations...Ch. A.2 - In Problems 930, perform the indicated operations...Ch. A.2 - In Problems 930, perform the indicated operations...Ch. A.2 - Prob. 20ECh. A.2 - In Problems 930, perform the indicated operations...Ch. A.2 - Prob. 22ECh. A.2 - In Problems 930, perform the indicated operations...Ch. A.2 - Prob. 24ECh. A.2 - Prob. 25ECh. A.2 - In Problems 930, perform the indicated operations...Ch. A.2 - Prob. 27ECh. A.2 - Prob. 28ECh. A.2 - Prob. 29ECh. A.2 - In Problems 930, perform the indicated operations...Ch. A.2 - In Problems 3144, perform the indicated operations...Ch. A.2 - Prob. 32ECh. A.2 - In Problems 3144, perform the indicated operations...Ch. A.2 - In Problems 3144, perform the indicated operations...Ch. A.2 - In Problems 3144, perform the indicated operations...Ch. A.2 - In Problems 3144, perform the indicated operations...Ch. A.2 - In Problems 3144, perform the indicated operations...Ch. A.2 - Prob. 38ECh. A.2 - Prob. 39ECh. A.2 - In Problems 3144, perform the indicated operations...Ch. A.2 - In Problems 3144, perform the indicated operations...Ch. A.2 - In Problems 3144, perform the indicated operations...Ch. A.2 - In Problems 3144, perform the indicated operations...Ch. A.2 - Prob. 44ECh. A.2 - Subtract the sum of the last two polynomials from...Ch. A.2 - Subtract the sum of the first two polynomials from...Ch. A.2 - In Problems 4750, perform the indicated operations...Ch. A.2 - Prob. 48ECh. A.2 - In Problems 4750, perform the indicated operations...Ch. A.2 - Prob. 50ECh. A.2 - If you are given two polynomials, one of degree m...Ch. A.2 - What is the degree of the sum of the two...Ch. A.2 - How does the answer to Problem 51 change if the...Ch. A.2 - How does the answer to Problem 52 change if the...Ch. A.2 - Prob. 55ECh. A.2 - Show by example that, in general, (ab)2a2b2....Ch. A.2 - Investment. You have 10,000 to invest, part at 9%...Ch. A.2 - Prob. 58ECh. A.2 - Prob. 59ECh. A.2 - Prob. 60ECh. A.2 - Prob. 61ECh. A.2 - Nutrition. Each ounce of food M contains 8 units...
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