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From Algorithms to Z-Scores - matloff - University of California, Davis

From Algorithms to Z-Scores - matloff - University of California, Davis

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CONTENTS vii<br />

7.3.1 Properties <strong>of</strong> Mean Vec<strong>to</strong>rs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140<br />

7.3.2 Covariance Matrices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140<br />

7.3.3 Example: (X,S) Dice Example Again . . . . . . . . . . . . . . . . . . . . . . . 141<br />

7.3.4 Example: Easy Sum Again . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142<br />

7.3.5 Example: Dice Game . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142<br />

7.3.6 Correlation Matrices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145<br />

8 Multivariate PMFs and Densities 149<br />

8.1 Multivariate Probability Mass Functions . . . . . . . . . . . . . . . . . . . . . . . . . 149<br />

8.2 Multivariate Densities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152<br />

8.2.1 Motivation and Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152<br />

8.2.2 Use <strong>of</strong> Multivariate Densities in Finding Probabilities and Expected Values . 152<br />

8.2.3 Example: a Triangular Distribution . . . . . . . . . . . . . . . . . . . . . . . 153<br />

8.2.4 Example: Train Rendezvouz . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156<br />

8.3 More on Sets <strong>of</strong> Independent Random Variables . . . . . . . . . . . . . . . . . . . . . 157<br />

8.3.1 Probability Mass Functions and Densities Fac<strong>to</strong>r in the Independent Case . . 157<br />

8.3.2 Convolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157<br />

8.3.3 Example: Ethernet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158<br />

8.3.4 Example: Analysis <strong>of</strong> Seek Time . . . . . . . . . . . . . . . . . . . . . . . . . 159<br />

8.3.5 Example: Backup Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160<br />

8.3.6 Example: Minima <strong>of</strong> Uniformly Distributed Random Variables . . . . . . . . 161<br />

8.3.7 Example: Minima <strong>of</strong> Independent Exponentially Distributed Random Variables161<br />

8.3.8 Example: Computer Worm . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163<br />

8.3.9 Example: Electronic Components . . . . . . . . . . . . . . . . . . . . . . . . . 164<br />

8.3.10 Example: Ethernet Again . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164<br />

8.4 Example: Finding the Distribution <strong>of</strong> the Sum <strong>of</strong> Nonindependent Random Variables 165<br />

8.5 Parametric Families <strong>of</strong> Multivariate Distributions . . . . . . . . . . . . . . . . . . . . 165

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