GOOD PRACTICE GUIDE FlOw MEAsUREMEnT …
good PRACTICE GUIDEFlOw MEAsUREMEnT uncertainty AnD data Foreword 21. MEAsUREMEnT uncertainty 3 Expressing uncertainty 3 Error versus uncertainty 4 uncertainty terminology 5 Evaluating uncertainty 6 Common sources of uncertainty 7 Reference sources 72 Calculation Methods 8 Introduction 8 Type A analysis 8 Arithmetic mean 8 Spread or standard deviation 9 Normal or Gaussian distribution 10 Type B analysis 11 Rectangular and normal distribution 11 Skewed distributions 123 Combining Uncertainties 13 Expressing a measured uncertainty 13 in terms of the required output Analytical method 13 Numerical method 14 Confidence levels 15 Root sum squared (quadrature) combination 16 Correlation 17 Handling correlation 17 Sources of correlation 184 The Standard (GUM) Method of 18 uncertainty Calculation Identifying uncertainty sources 18 and estimating their magnitude Budget Table: stage 1 19 Standard uncertainties 19 Combining the uncertainties 19 Explanation of combination 21 methods in the table The importance of uncertainty 21 in measurement5 Recommended Further Reading 216 data reconciliation 22 Introduction to data reconciliation 22 Practical application 22 Calculat
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