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Politics : The Trump Presidency -- Ignore unavailable to you. Want to Upgrade?

To: cosmicforce who wrote (89400)	8/16/2018 6:50:47 PM
From: i-node	Read Replies (2) \| Respond to of 354445

Of course. But I also read the papers by McIntyre & McKitrick, as well as a couple of books analyzing the problems with Mann's paper, most importantly the one I previously cited. One of many problems with the Mann papers -- something they didn't tell you in the papers -- is that M/M found you could use noise as input to Mann's software -- ". . . in order to test Mann's algorithm, it was necessary to see what it would do to red noise . . ." - Montford "To make absolutely certain he had headed off any potential objections, McIntyre was careful to ensure that the red noise series had exactly the same statistical characteristics as the noise in the tree ring series actually used in MBH98. And when he fed the results into the Mann PC routines -- bingo! Hockey sticks appeared. You could feed pretty much any group of red noise series into Mann's algorithm and, provided there was a rising or falling trend in the twentieth century it would give you a PC1 [principal component graph] shaped like a hockey stick." - Montford I'm not going through the entire process (I'd strongly recommend the book even if you aren't that interested in the topic, as it is a great mystery as it unravels), but this is just a sampling of the kinds of computational issues they found with the Mann papers. Just as a comment, you could NOT have found these problems by reading the papers. You would have HAD to experimentally re-create the analyses; and in fact, it took these two hard workers M/M a ton of work to do this as Mann was extremely uncooperative (peer review, my ass).