ASTM Int'l Standard Addresses Precision Issues for Color - ASTM E 2480
February 4, 2008 // Published as a news service by IHS
| |
| IHS Sells ASTM Documents |
| IHS is a leading provider of online access to large document collections from ASTM. For more information and a price quote, please complete the form below. |
|
ASTM International Committee E12 on Color and Appearance approved a standard that describes techniques for planning and analyzing the results of an interlaboratory study conducted for certain test methods within E12.
ASTM E 2480 - Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method with Multi-Valued Measurements is under the jurisdiction of Subcommittee E12.93 on Precision and Bias.
ASTM E 2480 was developed because interlaboratory studies for color involve special considerations that are not covered in other ASTM standards, according to Subcommittee E12.93.
The new practice is concerned with test methods that derive a multi-valued measurand such as, but not limited to, spectral reflectance, transmittance function, tristimulus values or RGB values.
Variations in measurements of such multi-valued measurands are usually analyzed by reducing the data to a single valued parameter such as a color difference. A normal distribution does not adequately describe the results of the single valued parameter analysis, according to ASTM International.
ASTM E 2480 uses a technique called bootstrapping or resampling, which does not depend on the distribution or the number of participating laboratories, said ASTM International.
The most likely users of ASTM E 2480 are members of the color community who deal with quality control issues in which the final result is a color difference.
Source: ASTM International.