4.5 Other Continuous Distributions

Content

• 4.5.1 The Weibull Distribution
• 4.5.2 The Lognormal Distribution
• 4.5.3 The Beta Distribution
• EXERCISES Section 4.5 (72-86)

Introduction

The normal, gamma (including exponential), and uniform families of distributions provide a wide variety of probability models for continuous variables, but there are many practical situations in which no member of these families fits a set of observed data very well. Statisticians and other investigators have developed other families of distributions that are often appropriate in practice.