This document specifies procedures suitable for the analysis of data which, when converted into logarithms
of the values, have either a normal or a skewed distribution. It is intended for use with test methods and
referring standards for glass-reinforced thermosetting plastics (GRP) pipes or fittings for the analysis of
properties as a function of time. However, it can also be used for the analysis of other data.
Two methods are specified, which are used depending on the nature of the data. Extrapolation using these
techniques typically extends a trend from data gathered over a period of approximately 10 000 h to a
prediction of the property at 50 years, which is the typical maximum extrapolation time.
This document only addresses the analysis of data. The test procedures for collecting the data, the number of samples required and the time period over which data are collected are covered by the referring standards and/ or test methods. Clause 6 discusses how the data analysis methods are applied to product testing and design.