Research on application of statistical model in cotton-inspection-proficiency testing

In the past,we typically used Z-score in the statistics analysis of the cotton-inspection-proficiency testing.But Z-score has some limitations in the selection of the reference number and analysis.In response to the problem,this paper will apply the grey clustering analysis which depends on the trigonal whitening weight function to divide the cluster objects into better and general categories through taking the fourteen laboratories as the cluster objects,cotton′s upper half mean length,etc.as five cluster indicators.Through the theoretical and experimental verifying in the cotton HVI proficiency testing,it shows that the gray clustering analysis may be used as a statistical model for the similar proficiency testing in the future.