bripat9643
Diamond Member
- Apr 1, 2011
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Thanks for saving me the trouble of doing that.
He doesn't. The NAS confirmed that his criticism of the Hockey Stick graph were valid.
I'm sure the CultOfMcIntyre told you that, and thus you believe it with all your heart. It's what cultists do. However, your cult lied to you. Let's check out what actually happened, as opposed to denialist cult revisionist history.
http://www.nytimes.com/2006/06/22/science/22cnd-climate.html?_r=0
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The panel said that a statistical method used in the 1999 study was not the best and that some uncertainties in the work "have been underestimated," and it particularly challenged the authors' conclusion that the decade of the 1990's was probably the warmest in a millennium.
But in a 155-page report, the 12-member panel convened by the National Academies said "an array of evidence" supported the main thrust of the paper. Disputes over details, it said, reflected the normal intellectual clash that takes place as science tests new approaches to old questions.
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Now, if you had any self-respect, you'd call your cult leaders to the carpet, and demand to know why they lied to you. After all, now you're left humiliated and twisting in the wind. You should be angry about that. Alas, I don't think you have the fortitude to demand honesty. Instead, you're going to crawl back to your cult and demand more lies.
And SSDD? Why did you lie and say the NAS refuted Mann, when the exact opposite happened? You got some 'splainin to do as well. Were you just a dupe like Bri, or were you being deliberately dishonest?
You are the liar around here and everyone knows it.
The NAS indicated that the hockey stick method systematically underestimated the uncertainties in the data (p. 107).
2. NAS agreed with the M&M assertion that the hockey stick had no statistical significance, and was no more informative about the distant past than a table of random numbers. The NAS found that Mann's methods had no validation (CE) skill significantly different from zero. In the past, however, it has always been claimed that the method has a significant nonzero validation skill. Methods without a validation skill are usually considered useless. Manns data set does not have enough information to verify its skill at resolving the past, and has such wide uncertainty bounds as to be no better than the simple mean of the data (p. 91). M&M said that the appearance of significance was created by ignoring all but one type of test score, thereby failing to quantify all the relevant uncertainties. The NAS agreed (p. 110).
3. M&M argued that the hockey stick relied for its shape on the inclusion of a small set of invalid proxy data (called bristlecone, or strip-bark records). If they are removed, the conclusion that the 20th century is unusually warm compared to the pre-1450 interval is reversed. Hence the conclusion of unique late 20th century warmth is not robustin other word it does not hold up under minor variations in data or methods. The NAS panel agreed, saying Manns results are strongly dependent on the strip-bark data (pp. 106-107), and they went further, warning that strip-bark data should not be used in this type of research (p. 50).
4. The NAS said " Mann et al. used a type of principal component analysis that tends to bias the shape of the reconstructions", i.e. produce hockey sticks from baseball statistics, telephone book numbers, and monte carlo random numbers.
5. The NAS said Mann downplayed the "uncertainties of the published reconstructions...Even less confidence can be placed in the original conclusions by Mann et al. (1999) that the 1990s are likely the warmest decade, and 1998 the warmest year, in at least a millennium.
A subsequent House Energy and Commerce Committee report chaired by Edward Wegman totally destroyed the credibility of the hockey stick.
CHAIRMAN BARTON: Dr. North, do you dispute the conclusions or the methodology of Dr. Wegmans report?
DR. NORTH [Head of the NAS panel]: No, we dont. We dont disagree with their criticism. In fact, pretty much the same thing is said in our report.
DR. BLOOMFIELD [Head of the Royal Statistical Society]: Our committee reviewed the methodology used by Dr. Mann and his co-workers and we felt that some of the choices they made were inappropriate. We had much the same misgivings about his work that was documented at much greater length by Dr. Wegman.
WALLACE [of the American Statistical Association]: the two reports [Wegman's and NAS] were complementary, and to the extent that they overlapped, the conclusions were quite consistent.