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12th CSITC round trial completed
29
Dec '09
The Twelfth Round Trial under the auspices of the Task Force on Commercial Standardization of Instrument Testing of Cotton (CSITC RT 2009-4) was conducted from October to December 2009. Sixty-three testing laboratories with 88 instruments participated.

In each Round Trial, five cotton samples with known values are mailed to each participating laboratory. Each sample is tested six times each day on each participating instrument for five days, for a total of 150 tests. Each sample is tested for the six CSITC parameters of length, length uniformity index, micronaire, strength, Rd (reflectance) and +b (yellowness). Accordingly, 900 separate test results (150 tests of 6 parameters) from each instrument are evaluated.

Instrument results for each Round Trial are collected by USDA and forwarded to the Bremen Fibre Institute for evaluation. Each instrument is given an overall ranking, as well as rankings for performance on each of the six parameters. Rankings are based on the first four upland cotton samples with known values. The purpose of the fifth cotton sample in all CSITC Round Trials is for special study purposes and is not used for performance-ranking.

Results for each instrument are confidential, but each testing facility receives an evaluation of its performance in the Round Trial and a detailed diagnostic analysis of results.

Rankings are based on the results of each instrument in coming closest to the mean (average) values for all instruments participating in the Round Trial on all six parameters. The range of scores for the combined properties among the 88 instruments was 0.21 to 1.13 (a score of zero would be perfect), and the median overall evaluation of combined properties was 0.53.

Results for the six properties over the twelve round trials have been highly consistent overall. However the standard deviations among instruments for Rd and +b increased in 2009. Additional evaluation of round trial results is being undertaken to determine the cause.

International Cotton Advisory Committee (ICAC)


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