MODELING THE CONVERSION OF MORTGAGE APPLICATIONS BY THE METHOD OF MULTIPLE REGRESSION IN TYPOLOGICAL GROUPS
The article discusses the application of the multiple regression method for modeling the conversion of mortgage applications in typological groups. The definition of typological groups is based on different phases of mortgage market activity and different conditions for granting loans. The open information of Sberbank was used as an information base for the study. The presented methodology will make it possible to assess the number of accepted mortgage applications depending on various parameters of the mortgage lending market. As factors influencing the number of accepted mortgage applications, the following characteristics of the market were considered: the number of accepted applications, the dollar rate, the weighted average interest rate and the average price per square meter. The paper considers several regression models at different stages of approval of applications and with different market activity. In this paper, the following types of multivariate linear models are considered: the direct selection model of significant factors and the model using the ridge regression method. Further, the analysis of the quality of the obtained models was carried out, and the most acceptable models were selected for each of the groups. Durbin-Watson coefficients, residual distribution histograms, scatter diagrams and average approximation errors were used as criteria for assessing the quality of the obtained models. To compare the quality of the constructed models, comparative diagrams of the coefficients of determination and the average approximation error were also built. In the conclusion of the work, the analysis methods used were compared with the methodology presented in the article and its effectiveness was proved. Since the presented methodology will make it possible to predict the load on mortgage lending managers and optimize the planning of mortgage activities.