Development and validation of QSPR models for corrosion inhibition of carbon steel by some pyridazine derivatives in acidic medium.

This are reflected by the highly significant cross-validated coefficient of determination ( R 2 cv = 0.92); which indicates a significant accordance between the results of the PLS, PCR and ANN as a QSPR models and the results of CV as an internal validation model and justifies that these proposed models, especially, possess a significantly statistical quality. 3.2.5.2 External validation To assess the quality of the prediction and the degree of performance of the final extrapolation models, the external test of validation was carried out.

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