ASTM G169-2021

ASTM G169-2021發行信息

標準號ASTM G169-01(2021)

中文名自然老化試驗基本統計方法應用的標準指南

英文名Standard Guide for Application of Basic Statistical Methods to Weathering Tests

發布日期2021

實施日期

廢止日期無

中國標準分類號A41

國際標準分類號19.040 (Environmental testing)

發布單位US-ASTM

ASTM G169-2021適用范圍

The correct use of statistics as part of a weathering program can greatly increase the usefulness of results. A basic understanding of statistics is required for the study of weathering performance data. Proper experimental design and statistical analysis strongly enhances decision-making ability. In weathering, there are many uncertainties brought about by exposure variability, method precision and bias, measurement error, and material variability. Statistical analysis is used to help decide which products are better, which test methods are most appropriate to gauge end use performance, and how reliable the results are.

Results from weathering exposures can show differences between products or between repeated testing. These results may show differences which are not statistically significant. The correct use of statistics on weathering data can increase the probability that valid conclusions are derived.

1.1''This guide covers elementary statistical methods for the analysis of data common to weathering experiments. The methods are for decision making, in which the experiments are designed to test a hypothesis on a single response variable. The methods work for either natural or laboratory weathering.

1.2''Only basic statistical methods are presented. There are many additional methods which may or may not be applicable to weathering tests that are not covered in this guide.

1.3''This guide is not intended to be a manual on statistics, and therefore some general knowledge of basic and intermediate statistics is necessary. The text books referenced at the end of this guide are useful for basic training.

1.4''This guide does not provide a rigorous treatment of the material. It is intended to be a reference tool for the application of practical statistical methods to real-world problems that arise in the field of durability and weathering. The focus is on the interpretation of results. Many books have been written on introductory statistical concepts and statistical formulas and tables. The reader is referred to these for more detailed information. Examples of the various methods are included. The examples show typical weathering data for illustrative purposes, and are not intended to be representative of specific materials or exposures.

1.5''This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

1.1“本指南涵蓋了風化試驗常用數據分析的基本統計方法。這些方法是用于決策的，在決策過程中，實驗被設計用來檢驗單個響應變量的假設。這些方法適用于自然風化或實驗室風化。

1.2“僅提供基本統計方法。有許多其他方法可能適用于也可能不適用于本指南未涵蓋的風化試驗。

1.3“本指南并非統計手冊，因此需要一些基礎和中間統計的一般知識。本指南末尾引用的教科書對于基礎培訓非常有用。

1.4“本指南未對材料進行嚴格處理。它旨在成為一個參考工具，用于將實用統計方法應用于耐久性和風化領域中出現的實際問題。重點是對結果的解釋。許多書都是關于介紹性統計概念、統計公式和表格的。讀者可參考這些文件以獲得更詳細的信息。包括各種方法的示例。示例顯示了用于說明目的的典型風化數據，并不代表特定材料或暴露。

1.5“本國際標準是根據世界貿易組織技術性貿易壁壘（TBT）委員會發布的《關于制定國際標準、指南和建議的原則的決定》中確立的國際公認標準化原則制定的。