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However the shortage of straightforward and reliable approaches for calculating variable importance and characterizing predictor response relationships has likely hindered the broader use of ANNs in ecology.
RF and other decision tree-based classifiers are nonparametric; that is, they do not assume underlying structure in a dataset and are useful for classification and regression modeling of complex biological data; RF implements a mechanism of calculating variable importance scores (VIM) by permutation testing.
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Subscript of a calculated variable.
To this end we calculated variable importance in the projection (VIP) for RT descriptors in a preliminary model (i.e. Model-2, vide infra).
To obtain the calculated variables, we used the following formulas: ● Cardiac index (CI) = Cardiac output/Weight.
Variables with colinearity were analyzed in different models (adjusted by primary variables or calculated variables respectively) to reduce the bias.
An experiment with 32 participants was conducted to compare values of these calculated variables with perceived openness.
The DICTION results of NRE-SEs' and NRE-CEs' master and calculated variables are displayed in Table 2.
The authors evaluated urinary indices which are actually calculated variables, dependent on multiple measured parameters.
The Technical Appendix describes the process followed to calculate variables used in the analysis.
The preprocessing phase calculates variables that are used by the core process and do not change during iterations.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com