Z-score is an important method for eval-uating the results of inter laboratory comparative ex-periments.The classic statistical methods,quartile robust statistical methods,iterative robust statistical methods(Algorithm A),and Q/Hampel robust sta-tistical methods for calculating Z-ratio scores are systematically introduced.And based on the sulfur content data of#92 vehicle gasoline(VIB)in an in-ter laboratory comparative test organized by a sales enterprise of SINOPEC Corporation,the differences in the evaluation results of the Z-ratio scores of four statistical methods were compared.This can provide a reference for selecting reasonable and effective sta-tistical analysis methods for inter laboratory compara-tive experiments,and improving the laboratory's de-tection ability and management level.
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