Inputs: 11 major and minor elemental oxides from soil/paleosol uppermost B horizons
Response: Mean annual precipitation and temperature (joint response)
Method: Thin-plate spline fitted to partial least-squares regression scores
Software required: SAS
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Inputs: 10 major and minor elemental oxides from soil/paleosol uppermost B horizons
Response: Mean annual precipitation
Method: Random forest regression
Software required: RStudio
Inputs: Bulk oxides, including Al2O3, CaO, Fe2O3, and TiO2, from soil/paleosol uppermost B horizons
Response: Soil pH (1:1 soil:H2O method)
Method: Sigmoidal regression
Software required: Excel or RStudio