Nature has an article on the top 50 science blogs taken from Technorati in which we do not occur. We have not registered at Technorati and am doing so now. The registration process requires that you do a post like this and insert the following in a message Technorati Profile I’m not entirely sure where […]
Nature has two online articles pertaining to the NAS Panel – one about the NAS Panel primarily relying on the press conference and another mentioning a prospective new NAS investigation into the data access problems left untouched by the past panel. The Nature reporter asked an interesting question at the press conference. I’ve provided a […]
Von Storch et al 2004 advocated using climate models to generate pseudoproxies to test the properties of proposed multivariate methods. Hardly unreasonable. I might argue that these are long-winded ways of generating proxy series with certain kinds of temporal and spatial covariance structures, but there’s much to be said for testing methods on some standard […]
Posted in Multivariate, RegEM
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Tagged mixed effects, multivariate, nlme, overfitting, pseudoproxy, r2, random effects, ridge, stone, stone and brooks, storch, von storch, zorita
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The review of referee #2 for Bürger and Cubasch’s article in Climates of the Past is posted up here . From the style, can anyone doubt that the anonymous reviewer was Mann himself? Take a read. The reviewer makes reference to this being the "2nd attempt by the authors to publish this flawed manuscript" – […]
The NAS Panel notes the following about several statistics used in proxy studies: If are the predictions from a linear regression of on the proxies, and the period of interest is the calibration period, then RE, CE, and are all equal. Here’s a result about MBH methods (and applicable to related methods with re-scaling) that […]
There is another terrific article by Bürger and Cubasch posted up here . I’ve just looked at for a few minutes so far and it will take time to fully digest, but one can tell right away that it is a very interesting and stimulating article. Gerd Bürger notified me of it and I therefore […]
The NAS Panel claimed that MBH98 was the "first systematic" multiproxy study. It wasn’t; it didn’t even claim to be, citing Bradley and Jones 1993 and several other studies of the same vintage as predecessors. Crowley was a peer reviewer for the NAS panel, who presumably relied on him to catch this sort of mis-step. […]
Jean S pointed out the following quote from the NAS Report and suggested that this be discussed: The first systematic, statistically based synthesis of multiple climate proxies was carried out in 1998 by M.E.Mann, R.S.Bradley and M.K. Hughes (Mann et al. 1998); their study focused on temperature for the last 600 years in the Northern […]
Interesting title, no? What if I added Principal Components to this odd concatenation of concepts? Galluccio et al 1998 published a paper with the above title here, which has led to a number of follow-ups, which you can locate by googling. I’ll try to summarize Galluccio’s basic idea and then tie it back into principal […]
One bit of housekeeping that I want to tidy up before more NAS postings: a couple of months ago, Eduardo Zorita kindly sent me comprehensive data from ECHO-G, on which, unfortunately, I’ve so far not been able to spend as much time on so far as I would have liked. So much to do, so […]
Climate Audit 
Nature on NAS
Nature has two online articles pertaining to the NAS Panel – one about the NAS Panel primarily relying on the press conference and another mentioning a prospective new NAS investigation into the data access problems left untouched by the past panel. The Nature reporter asked an interesting question at the press conference. I’ve provided a […]