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Significance and Use
5.1.1 If there are differences of practical significance between reported test results for two laboratories (or more), comparative test should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, use the samples for such a comparative test that are as homogeneous as possible, drawn from the same lot of material as the samples that resulted in disparate results during initial testing and randomly assigned in equal numbers to each laboratory. The test results from the laboratories involved should be compared using a statistical test for unpaired data, a probability level chosen prior to the testing series. If bias is found, either its cause must be found and corrected, or future test results for that material must be adjusted in consideration of the known bias.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D123 Terminology Relating to Textiles
D1776 Practice for Conditioning and Testing Textiles
D4850 Terminology Relating to Fabrics and Fabric Test Methods
D7023 Terminology Relating to Home Furnishings
Other StandardANSI/ASQC Z1.4--Inspection by Attributes Available from American National Standards Institute, 11 W. 42nd St., 13th Floor, New York, NY 10036.
ICS Number Code 59.080.30 (Textile fabrics)
UNSPSC Code 11161800(Synthetic fabrics)
ASTM D3775-12, Standard Test Method for Warp (End) and Filling (Pick) Count of Woven Fabrics, ASTM International, West Conshohocken, PA, 2012, www.astm.orgBack to Top