标准物质中痕量元素分析数据的处理—几种强估计值的计算

Statistical Treatment of Trace Element Data of Reference Materials

(一)对分析数据做统计学处理,可由计算得的统计量来推断真值。通常假定:在排除了分析方法的系统误差后,无限次测量结果的平均值为真值的最佳估计量,此时,各测量值的频数分布为正态分布。

The following robust estimators have been used to evaluate the rare earth element raw data of the Geochemical Reference Samples DZΣ-1 and DZΣ-2:Median,modian,Gastwirth mean,trimean and Hampel M-estimators.Most of the results obtained appeared to be in good agreement with the certified values,and it is difficult to draw conclusion which estimator is the best approach for finding the best value.However,the Hampel M-estimators are deserving of study and further applications.A computer programme written in BASIC for the computation of the Hampel M-estimators is given.