Structural similarity index SSIM of the forecast against the cycle strength, as given by the Monthly Group Maximum sunspot number (Hathaway 2015b). The results show that the method is most effective for medium cycles. We did not include attempts to forecast cycles 11 to 14 since the method requires enough past data, according to the auto-calibrated parameters J and L; to forecast these cycles with this method we would need data prior to 1874.
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