Internal and external validation of the developed model was carried out using the LOO method by calculating statistical parameters and meeting critical requirements for a model to be robust.
The optimum CoMFA model was developed using known inhibitors and the predictive ability of model was examined by statistical parameters like q2 = 0.552 and r2pred = 0.636.
In addition, the lack-of-fit test diagnoses how well each terms of the full model fit the data that pillared by statistical parameters such as RAdj, RPred and PRESS [36, 37].
In addition, the validity of the PLS-DA model was assessed by statistical parameters: the correlation coefficient R and the cross-validation correlation coefficient Q. R represents the goodness of the fit to the model and Q reveals the predictability of the model [ 22].
Based on three-dimensional quantitative structure activity relationship (3D-QSAR) methods including comparative molecular field analysis (CoMFA) and comparative molecular similarity indices analysis (CoMSIA), two 3D-QSAR models for a series of non-purine xanthine oxidase (XO) inhibitors were established, and their reliability was supported by statistical parameters.
This review was therefore focused and selective rather than a systematic review, and the search was not defined by statistical parameters but rather by a series of decisions by the authors to include or not include papers based on the pertinence of the information they contained.
Also, the 3-D surface topography was described by statistical parameters, according to ISO 25178-2 2012. 25178-2 2012
The scatterers are represented by statistical parameters without having a real physical location.
As explained hereinafter, this goal is accomplished by statistical parameters of an order higher than two.
However, the positioning system could introduce a location error defined by statistical parameters (mean error, standard deviation, etc).
