Time Series Forecasting, Fourier, Ensemble Method, Data Science, Signal Processing.
s(4,4) time 1956Q1 1.0 1.0 1.0 0.179989 0.000000 0.000000 0.000000 1956Q2 1.0 2.0 4.0 0.000000 0.181109 0.000000 0.000000 1956Q3 1.0 3.0 9.0 0.000000 0.000000 0.182306 0.000000 1956Q4 1.0 4.0 16.0 0.000000 0.000000 0.000000 0.183581 1957Q1 1.0 5.0 25.0 0.184932 0.000000 0.000000 0.000000 ... ...