Approved Work Item
ISO/AWI 6139
Aluminium ores — Experimental determination of the heterogeneity of distribution of a lot
Reference number
ISO/AWI 6139
Edition 2
Approved Work Item
ISO/AWI 6139
90612
A working group has prepared a draft.
Will replace ISO 6139:1993

Abstract

The heterogeneity of distribution is characterized by the distribution variance and is determined by experimentally measuring the sampling variance. Because both the composition variance and distribution variance contribute to the measured sampling variance, it is necessary to separate these two components. Two methods of data analysis are permitted: Visman's theory of sampling which uses classical statistics and the variogram method which gives a better estimate because of taking into account serial correlation between adjacent increments.

General information

  •  : Under development
    : New project registered in TC/SC work programme [20.00]
  •  : 2
  • ISO/TC 79/SC 12
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