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1. The Pearson correlations presented in Table 5 do not show significant correlations between OM and the four metals in soils/sediments (lines 258-260). In Figure 3, the sequential extraction results show that a major fraction of copper (Cu) resides within the organic matter fraction of the soils/sediments. The Pearson correlation between OM and Cu therefore is misleading.
2. Only Pearson Correlations are reported. There are others such as the goodness of fit (F-test) of the multivariate model and significance of the coefficients (including interaction terms between independent variables). The conclusions based on the analysis provided are not strong: for example, the data show that a major fraction of the copper resides in the organic matter matrix of the soils/sediments, but the Pearson correlation between OM and Cu is not significant.
The authors have a choice to exclude their statistical analysis.
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4Â¥: Originally posted by xiaohelala at 2013-05-06 15:22:29
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