A "calibration period" is a designated time when adjustments or fine-tuning are made to a device, system, or process to ensure it is accurate, precise, or in proper working condition. Full definition
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The 1950 - 1960 data calibration period becomes a random occurrence. (climateaudit.org)
Instead of standardizing each proxy series on the mean of the whole series before transforming into a set of PCs, Mann et al standardized on the mean during the instrumental calibration period. (deepclimate.org)
Furthermore, methods that impose a space - time structure based on a modern calibration period assume that such patterns are stationary over time, and some implicitly consider remote teleconnection to be stable. (eos.org)