Kropyvnytska, V., Kopystynskyy, L. and Sementsov, G. 2017. Development of a set of methods for preforecasting fractal time series analysis to determine the level of persistence. Eastern-European Journal of Enterprise Technologies. 3, 4 (87) (Jun. 2017), 10–17. DOI:https://doi.org/10.15587/1729-4061.2017.104425.