ICS 03.120.30                          MSD 03

Reaffirmed 2020

NATIONAL FOREWORD

This Indian Standard (Part 8) which is identical with ISO 16269-8 : 2004 ‘Statistical interpretation of data — Part 8: Determination of prediction intervals’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Statistical Methods for Quality and Reliability Sectional Committee and approval of the Management and Systems Division Council.

This standard (Part 8) is a part of IS/ISO 16269 under the general title ‘Statistical interpretation of data’. Other parts in this series are:

Part 4 Detection and treatment of outliers

Part 6 Determination of statistical tolerance intervals

Part 7 Median - Estimation and confidence interval

Prediction intervals are of value wherever it is desired or required to predict the results of a future sample of a given number of discrete items from the results of an earlier sample of items produced under identical conditions. They are of particular use to engineers who need to be able to set limits on the performance of a relatively small number of manufactured items. This is of increasing importance with the recent shift towards small-scale production in some industries. The purpose of this standard is twofold:

- to clarify the differences between prediction intervals, confidence intervals and statistical tolerance intervals;

- to provide procedures for some of the more useful types of prediction interval, supported by extensive, newly-computed tables.

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.