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Regression analysis is a well-established method to correct for grain size differences in suites of sediments. However, distortion caused by the presence of outliers and imprecision in both variables can hinder many common regression models from performing adequately. Median sum of weighted residuals (MSWR) regression is strongly outlier-resistant and accounts for imprecision in both variables for each member of a dataset. In a case study of Ni and Pb normalization for a suite of stream sediments in NW Iran, the a...

In geochemical stream sediment surveys in Moghangegh Region in NW of Iran, sheet 1:50,000, 152 samples were collected and after analyze and processing of data, it is revealed that Yb, Sc, Ni, Li, Eu, Cd, Co, As contents in one sample is far higher than other samples. After detecting this sample as the outlier sample, affect of this sample was investigated in multivariate statistical data processing to investigate destructive effects of outlier sample existence in geochemical exploration. Pearson and spearman corre...