keskiviikko 30. joulukuuta 2009

"IPCC + 55 nonsense"


"At that time I tried to illustrate the "consistent with" fallacy in the context of IPCC projections using the following graph. The blue curve shows a curve fit to 8-year surface temperature trends from 55 realizations from models used by IPCC (the fact that it was 8 years is irrelevant to this example). With the red curve I added 55 additional "realizations" produced from a random number generator. The blue dot shows the observations. Obviously, the observations are more "consistent with" the red curve than the blue curve. We can improve consistency by making worse predictions. There is obviously something wrong with this approach to comparing models and observations"

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