DETERMINING A PIECEWISE-LINEAR TREND OF A NON-STATIONARY TIME SERIES BASED ON INTELLIGENT DATA ANALYSIS. II. MACHINE EXPERIMENTS AND PRACTICAL PROBLEM SOLUTIONS
P. S. Knopov, Arnold S. Korkhin · Kibernetyka ta Systemnyi Analiz · 2024
The article describes the results of the approbation of the method of constructing a piecewise-linear trend, which can have breaks at the switching points as well as be continuous at these points, i.e., represent a linear flow. An example of applying the method for constructing a linear regression with switches, which has two independent variables with a trend, is considered. The problem of spline approximation of the time series of logarithms of the number of infected people with COVID-19 in Ukraine is stated and solved. Keywords: trend, regression, switch point, spline, real-time calculation.