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• Linear Trend Fit Curve yFIT: The trend fit curve for each 11-years timeframe is calculated using the above difference bi as the slope:
where i is the center year of the current 11-years timeframe and j runs from i - 5 to i + 5.
• Detrended Standard Deviation s: The fitted trend curve is removed from the original data y to obtain the detrended standard deviation for the current timeframe:
• Signal-to-Noise Ratio (SNR): Finally, the signal-to-noise ratio is defined as the ratio of the trend to the standard deviation:
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