[PapaBear3625]

Sensenbrenner said the 2006 National Academy study showed Mann's hockey stick was incorrect and that Mann's theory was discredited. But Holdren said the NAS study had quibbles with Mann's methods but agreed with his results.

From a 2004 MIT study about the hockey stick:

Now comes the real shocker. This improper normalization procedure tends to emphasize any data that do have the hockey stick shape, and to suppress all data that do not. To demonstrate this effect, McIntyre and McKitrick created some meaningless test data that had, on average, no trends. This method of generating random data is called Monte Carlo analysis, after the famous casino, and it is widely used in statistical analysis to test procedures. When McIntyre and McKitrick fed these random data into the Mann procedure, out popped a hockey stick shape!

[SeattleBruce]

When McIntyre and McKitrick fed these random data into the Mann procedure, out popped a hockey stick shape!
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Well looky there!