De’ath et al (Science 2009) here SI received a considerable amount of press at the start of 2009. De’ath et al reported that the there was an “unprecedented” decline in Great Barrier Reef coral calcification: The data suggest that such a severe and sudden decline in calcification is unprecedented in at least the past 400 […]
Many CA readers know a lot about regression and quite a bit about principal components, but I dare say that a much fewer number are familiar with Truncated Total Least Squares (to which the regpar parameter belongs.) We’re seeing interesting interactions between PC=k and regpar=r – and there is little, if anything, in regular statistical […]
In his RC post yesterday – also see here – Steig used North et al (1982) as supposed authority for retaining three PCs, a reference unfortunately omitted from the original article. Steig also linked to an earlier RC post on principal components retention, which advocated a completely different “standard approach” to determining which PCs to […]
During the 12-hour interval that Steig deigned to permit comments on his “Tutorial” about principal components, he made the following backhanded criticism of blogger communications with him: [Response: Ryan: Unlike most of your fellow bloggers, you have been very gracious in your communications with me. They could learn something from you. I don’t know how […]
A lengthy feature on doubles squash in today’s Globe and Mail. It’s such a great sport. The match discussed here was at our club’s finals night. For Toronto readers, in the print edition of the paper, they had a wide-angle photo of the spectators in the gallery – I’m just at the edge of the […]
Geert Jan van Oldenburgh of KNMI develops and, in his part time, maintains excellent KNMI’s Climate Explorer. I recommend that Curt Covey of PCMDI examine whether they should abandon their own much less satisfactory access points. Hadley Center as well. The other day, I was interested in deriving a HadISST monthly tropical average. The data […]
Verification of the Improved High PC Reconstruction
Last year, I reported the invalidity using up-to-date data of Santer’s claim that none of the satellite data sets showed a “statistically significant” difference in trend from the model ensemble, after allowing for the effect of AR1 autocorrelation on confidence intervals. Including up-to-date data, the claim was untrue for UAH data sets and was on […]
I’ve just collated ERSST v3b and ERSST v2 versions for the tropics and compared ERSST v3 and ERSST v2 versions. CA readers were undoubtedly ready for adjustments, but, using the technical terminology of the leading climate journals, the adjustments were “worse than we thought”. ERSST v3 lowered SSTs before 1880 by up to 0.3 deg […]
In case you’ve missed it, WUWT has an excellent post on failure of a sea ice satellite sensor – now taken offline.
Climate Audit 