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Table 6 Models fitted for factors obtained from principal component analysis and selecting the best interpolation method

From: Risk assessment of heavy metal soil pollution through principal components analysis and false color composition in Hamadan Province, Iran

Factors Interpolation method Model Nugget Partial sill Sill Mean range Mean Root mean square
Factor 1 Ordinary kriging Exponential 0 1.009 1.009 21035.1 0.027 0.853
Factor 2 Radial basis functions - - - - - 0.015 1.003
Factor 3 Radial basis functions - - - - - 0.001 0.874
Factor 4 Radial basis functions - - - - - 0.002 0.785