The article presents the results of the initial data preparation for the construction of a predictive mathematical model in the study of the deformation process of a high-rise building. The possibilities of forming statistically homogeneous groups of realizations using graphs constructed in the software product Surfer and analytical calculations using the coefficients of variation, calculation of Mahalanobis distances and Hotteling criterion when grouping statistically uniform observation cycles have been shown. The forecast of possible precipitations with the use of the constructed predictive model was performed.