GB/T 4883-2008Statistical interpretation of data - Detection and treatment of outliers in the normal sample (English PDF)

National Standard of the People's Republic of China

ICS

03.120.30

Classification

A 41

Replacing

GB/T 4883-1985

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Contents

• Foreword i
• Introduction iii
• 1 Scope
• 2 Normative references
• 3 Terms, definitions and symbols
• 3.1 Terms and definitions
• 3.2 Symbols and abbreviations
• 4 Outlier detection
• 4.1 Source and detection
• 4.2 Three cases of outliers
• 4.3 Upper limit of the number of detection outliers
• 4.4 Single outlier case
• 4.5 Test rules for determining multiple outliers
• 5 Outlier treatment
• 5.1 Methods
• 5.2 Rules
• 5.3 Recording
• 6 Rules for detecting outliers in the case of known standard deviation
• 6.1 General rules
• 6.2 Rules for detecting outliers
• 6.2.1 Upper case
• 6.2.2 Lower case
• 6.2.3 Two-sided case
• 6.3 Example of using Nair's test
• 7.1 General rules
• 7.2 Grubbs' test
• 7.2.1 Upper case
• 7.2.2 Lower case
• 7.2.3 Two-sided case
• 7.2.4 Example of using Grubbs' test
• 7.3 Dixon's test
• 7.3.1 One-sided case
• 7.3.2 Two-sided case
• 7.3.3 Examples of using Dixon's test
• 8.1 General rules
• 8.2 Skewness-kurtosis test
• 8.2.1 Service conditions
• 8.2.2 One-sided case - skewness test
• 8.2.3 Two-sided case - kurtosis test
• 8.2.4 Example of repeated use of kurtosis test
• 8.3 Dixon's test
• 8.3.1 Rules of Dixon's test
• 8.3.2 Examples of repeated use of the Dixon's test
• Annex A (Normative) Table of statistical values
• Annex B (Informative) Guidelines for selecting outlier detection methods and treatment rules
• B.1 Purpose of determining and treating outliers
• B.2 Selection of various test methods
• B.3 Pay attention to the information given by the detected outliers
• Annex C (Informative) Dixon's test when n > 30
• Bibliography