Arash Nademi - Department of Statistics, Ilam Branch, Islamic Azad University, Ilam, Iran
Elham Shafiei - Psychosocial Injuries Research Center, Ilam University of Medical Sciences, Ilam, Iran
Esmaeil Fakharian - Truma Research Center, Kashan University of Medical Sciences, Kashan, Iran
Abdollah Omidi - Department of Clinical Psychology, Kashan University of Medical Sciences, Kashan, Iran

Introduction: In Processes Modeling, when there is relatively a high correlation between covariates, multicollinearity is created, and it leads to reduction in model's efficiency. In this study, by using principle component analysis, modification of the effect ofmulticolinearity in Artificial Neural Network (ANN) and Logistic Regression (LR) hasbeen studied. Also, the effect of multicolinearity on the accuracy of prediction of mentaldisorders after trauma in patients with Mild Traumatic Brain Injury has been investigated.Methods: In a prospective cohort Study, first, during ۶ months period, ۱۰۰ patients with Mild Traumatic Brain Injury have been selected .Then, by using Primary Covariates and Principle Component Analysis, Logistic Regression and ANN models have been conducted and based on these models prediction have been done. (Receiver Operating Characteristic) ROC curve and Accuracy Rate have been used to compare the strength of model’s prediction.Results: The results revealed that Accuracy Rate for ANN before and after applyingprinciple component analysis are ۸۴.۲۲ and ۹۱.۲۳% respectively, and for LogisticRegression models are ۷۲.۳۳% and ۷۴.۸۹% respectively.Conclusion: The study showed that the Accuracy Rate was higher for models based onPrinciple Component Analysis including primary covariates; hence, when multicolinearityexists, models that use the principle component for prediction of mental disorders aremore effective compare to other methods. Also, ANN Models are more effective thanRegression models.

Traumatic, Brain Injury, Mental disorder, Logistic Regression