Design Decisions under Uncertainty with Limited Information

1. Design Decision under Uncertainty 1.1 Decision under Uncertainty 1.1.1 Good versus bad decisions 1.1.2 Elements of a Decision 1.1.3 Limited Information 1.2 The Role of Decision Analysis in Engineering Design 1.2.1 Sequential decisions in product development 1.2.2 Challenges in design decision making under uncertainty and scope of this book 1.3 Outline of this Book 1.4 Conclusion Questions References 2. Overview of Theories of Uncertainty and Tools for Modeling Uncertainty 2.1 Introduction: Management of Uncertainty in Design 2.2 Theories of Uncertainty 2.2.1 Intervals 2.2.2 Convex Sets 2.2.3 Objective Probability 2.2.4 Subjective Probability 2.2.5 Imprecise Probability 2.2.6 Dempster-Shafer Evidence Theory 2.3 Conclusion References 3. Objective Probability Overview of this chapter 3.1 Probability and Random Variables for Modeling Uncertainty 3.1.1 Fundamentals of Objective Probability 3.1.1.1 Definition of probability 3.1.1.2 Axioms of probability 3.1.1.3 Conditional probability 3.1.1.4 Combined experiments Questions and Exercises 3.1.2 Random variables 3.1.2.1 Discrete random variables 3.1.2.2 Continuous random variables 3.1.2.3 Conditional Probability Distribution and Density Functions Questions and exercises 3.1.3 Multiple random variables 3.1.3.1 Discrete random variables 3.1.3.2 Continuous random variables Questions and exercises 3.2 Common probabilistic models 3.2.1 Distributions of a single random variable 3.2.1.1 Discrete variables 3.2.1.2 Continuous variables 3.2.2 Joint normal distribution Summary of section 3.2 Questions and Exercises 3.3 Probability calculations 3.3.1 Probability distributions of a function of one random variable 3.3.1.1 Probability distribution 3.3.1.2 Probability density function 3.3.1.3 Mean value and standard deviation of a function of one variable 3.3.2 Distribution of functions of multiple random variables 3.3.1.1 One function of two variables 3.3.2.2 Two functions of two random variables 3.3.2.3 The method of auxiliary variables 3.3.2.4 Mean value and standard deviation of a function of many variables 3.3.2.5 Calculations involving normal random variables Questions and Exercises 3.4 Concluding Remarks References Appendix 4. Statistical Inference - Constructing Probabilistic Models from Observations 4.1 Introduction 4.1.1 Objective, scope and summary of this chapter 4.2 Estimating mean values of random variables and probabilities of events 4.2.1 Sample mean 4.2.2 Sample variance 4.2.3 Covariance and Correlation 4.2.5 Confidence Interval for Variance 4.2.6 Probability of an Event 4.2.7 How to get the maximum return from your budget for data collection 4.3 Statistical hypothesis testing 4.4 Selecting input probability distributions 4.4.1 Step 1: Select families of probability distributions 4.4.2 Step 2: Estimate the distribution parameters 4.4.3 Step 3: Assess fit of selected distributions to observed data 4.5 Modeling dependent variables 4.5.1 Overview of methods for modeling dependence 4.5.2 Copulas for modeling dependence 4.6 Conclusion References 5. Probabilistic Analysis of Dynamic Systems 6. Subjective (Bayesian) Probability 6.1 Definition of Subjective Probability 6.1.1 Overview 6.1.2 Axiomatic definition of probability 6.1.3 Conditional probability 6.1.4 Principle of insufficient reason Questions and problems 6.2 Eliciting Expert's Judgments in Order to Construct Models of Uncertaint 6.2.1 Elicitation process 6.2.2 Eliciting probabilities 6.2.3 Estimation of probabilities of rare events 6.2.4 Eliciting probability distributions 6.2.5 Representing uncertainty about an elicited distribution by a second-order probabilistic model Questions and Problems 6.3 Bayesian Analysis 6.3.1 Motivation 6.3.2 How to update a probability distribution using observations or expert judgment 6.3.3 Accounting for imprecision by using probability bounds Questions and Problems 6.4 Heuristics and biases in probability judgments Questions 6.5 Concluding remarks References 7. Decision Analysis 7.1 Introduction 7.1.1 Examples of Decision Problems 7.1.2 Elements of Decision Problems and Terminology 7.1.4 Steps of the Decision Process 7.1.5 Outline of this chapter Questions and Problems 7.2 Framing and Structuring Decisions 7.2.1 Define and frame a decision 7.2.2 Structure a Decision Problem Questions and problems 7.3 Solving Decision Problems 7.3.1 Backward induction (or folding back the decision tree) Exercises and problems 7.4 Performing Sensitivity Analysis 7.4.1 Introduction 7.4.2 Sensitivity to the definition, framing and structure of the problem 7.4.3 One-way sensitivity analysis 7.4.4 Two-way sensitivity analysis 7.4.5 Sensitivity of the selection of the optimum option to imprecision in probabilities Questions and problems 7.5 Modeling Preferences 7.5.1 Motivation 7.5.2 Simple criteria for decision making 7.5.3 Utility 7.5.4 Axioms of utility Questions and problems 7.6 Conclusion References 8. Multiattribute Considerations in Design 8.1 Tradeoff between attributes 8.1.1 Range of negotiability 8.1.2 Value functions vs. Utility functions Question and Problems: 8.2 Different multiattribute formulations 8.2.1 Single-Attribute based formulations 8.2.1.1 Independence conditions 8.2.1.2 The additive form of multiattribute utility function 8.2.1.3 The multi-linear form of multiattribute utility function 8.2.2 Assessing the scaling constants 8.2.3 Value function based formulation 8.2.4 Attribute dominance utility and multiattribute utility copulas 8.3 Solving decision problems under uncertainty using multiattribute utility analysis 8.4 Conclusions Questions and Problems References