ISO 7870-2-2013 pdf free.Control charts – Part 2: Shewhart control charts.
The following referenced documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3534-2. Statistics — Vocabulary and symbols — Part 2: Applied statistics
ISO 16269-4, Statistical interpretation of data — Part 4: Detection and treatment of outliers
ISO 5479, Statistical interpretation of data — Tests for departure from the normal distribution
ISO 22514 (all parts), Statistical methods in process management — Capability and performance
3 Terms, definitions and symbols
3.1 General
For the purposes of this document, the terms and definitions given in ISO 3534-2:2006 apply.
3.2 Symbols
NOTE The ISO/IEC Directives makes it necessary to depart from common SPC usage in respect to the differentiation between abbreviated terms and symbols. In ISO standards an abbreviated term and its symbol can differ in appearance in two ways: by font and by layout. To distinguish between abbreviated terms and symbols, abbreviated terms are given in Cambria upright and symbols in Cambria or Greek italics, as applicable. Whereas abbreviated terms can contain multiple letters, symbols consist only of a single letter. For example. the conventional abbreviation of upper control limit, IJCL, is valid but its symbol in equations becomes UCL. The reason for this is to avoid misinterpretation of compound letters as an indication of multiplication.
In cases of long established practice where a symbol and/or abbreviated term means different things in different applications, it is necessary to use a field limiter, thus ( ), to distinguish between them. This avoids the alienation of practitioners by the creation of unfamiliar abbreviated terms and symbols in their particular field that are unlike all related texts, operational manuals and dedicated software programs. An example Is the abbreviated term ‘R’ and symbol ‘R’ which means different things in metrology from that in acceptance sampling and statistical process control. The abbreviated term ‘R’ is differentiated thus:For the purposes of this document, the following symbols apply.ISO 7870-2 pdf free download.