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Matrix Differential Calculus with Applications in Statistics and Econometrics, 3rd Edition
book

Matrix Differential Calculus with Applications in Statistics and Econometrics, 3rd Edition

by Jan R. Magnus, Heinz Neudecker
March 2019
Intermediate to advanced
504 pages
11h 3m
English
Wiley
Content preview from Matrix Differential Calculus with Applications in Statistics and Econometrics, 3rd Edition

Chapter 12Statistical preliminaries

1 INTRODUCTION

The purpose of this chapter is to review briefly those statistical concepts and properties that we shall use in the remainder of this book. No attempt is made to be either exhaustive or rigorous.

It is assumed that the reader is familiar (however vaguely) with the concepts of probability and random variables and has a rudimentary knowledge of Riemann integration. Integrals are necessary in this chapter, but they will not appear in any other chapter of this book.

2 THE CUMULATIVE DISTRIBUTION FUNCTION

If x is a real‐valued random variable, we define the cumulative distribution function F by

equation

Thus, F(ξ) specifies the probability that the random variable x is at most equal to a given number ξ. It is clear that F is nondecreasing and that

equation

Similarly, if (x1, … , xn)′ is an n × 1 vector of real random variables, we define the cumulative distribution function F by

equation

which specifies the probability of the joint occurrence xiξi for all i.

3 THE JOINT DENSITY FUNCTION

Let F be the cumulative distribution function of a real‐valued random variable x. If there exists a nonnegative real‐valued (in fact, Lebesgue‐measurable) function f such that ...

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Publisher Resources

ISBN: 9781119541202Purchase book