Semnan UniversityInternational Journal of Nonlinear Analysis and Applications2008-6822151220241201Correlation estimation between samples based on covariance, graph theory and graph neural network185201843810.22075/ijnaa.2023.28936.4027ENEbrahim KhaliliDepartment of Computer Engineering, Yasooj Branch, Islamic Azad University, Yasooj, IranRazieh MlekhosseiniDepartment of Computer Engineering, Yasooj Branch, Islamic Azad University, Yasooj, IranS. Hadi YaghoubianDepartment of Computer Engineering, Yasooj Branch, Islamic Azad University, Yasooj, IranHamid ParvinDepartment of Computer Engineering, Yasooj Branch, Islamic Azad University, Yasooj, IranKaramollah BagherifardDepartment of Computer Engineering, Yasooj Branch, Islamic Azad University, Yasooj, IranJournal Article20221109One of the standard criteria for expressing the relationship between two random variables is the correlation coefficient. Correlation between variables shows that changing the value of one variable leads to changing another variable in a certain direction. It is also possible to use the value of one variable to predict the value of another. In statistics, the correlation coefficient measures the direction and strength of the tendency to change. In machine learning, the correlation coefficient is known as a measure of classification quality. In fact, as a starting step for classification, the correlation between different samples should be estimated using a specific method. There are various methods to estimate the correlation of different data types, which have disadvantages such as low accuracy or high computational time. One of the methods that can overcome these problems, due to its high capability in modeling correlation between samples is graphical modeling. In this research, a new covariance model based on graph theory and graph neural network for estimating the correlation between samples is presented. The results show the improvement of the proposed model in accuracy, sensitivity, precision, F-Micro, F-Macro and statistical tests compared to Pearson and cosine methods.https://ijnaa.semnan.ac.ir/article_8438_6a7502f0cb62d3f941f9b589efad571d.pdf