“…The reconstructed series using LS estimator has the lowest possible (zero) signal distortion and the highest possible noise level. Note that the results of noise reduced series using SSA technique (based on the LS estimate), are better than those obtained by classical methods which use noisy series (for comparison between SSA and classical time series methods see, for example, [1,10,12,19]). But as we mentioned above the reconstructed series still has some part of the initial noise level δY N due to the nature of LS estimate.…”