Heterogeneous areas-identification of outliers and calculation of soil sampling uncertainty using the modified RANOVA method.

ABSTRACT: We modified the robust analysis of variance (RANOVA) method to calculate sampling uncertainty of selected trace elements determined in soil samples from two heterogeneous remote historic metal ore mining areas. Classical RANOVA is down-weighting the outlying values by replacing them during the calculation process with mean ± c·σ _r . Because the arithmetic mean is greatly influenced by outliers, it cannot represent a robust statistic. The main novel contribution of this work is use of median value that is independent on outliers and replace all extreme values during the calculation process with median ± 2·σ _r . In our work, 18 duplicate, composite soil samples were collected, digested with aqua regia in a closed microwave system, and analyzed twice for selected trace e

SUBMITTER: Dolegowska S 

PROVIDER: S-EPMC5033995 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature