Yesterday while at ICCC, I had a chance to talk with Steve McIntyre at length about the state of the Climate Audit server. As many of you know, Climate Audit failed a couple of weeks ago and was down for almost 3 days due to a hard drive failure. Even with RAID1, it didn’t prevent […]
I’m going to be away for most of the next two weeks – I’ll be in New York for a couple of days and then I’m going to Thailand with my wife and daughter to visit one of my sons. I’ll be spotty in internet connection and posting. I’ve asked a couple of regulars to […]
On Feb 26, Garth Paltridge, Albert Arking and Michael Pook’s report on a re-examination of NCEP reanalysis data on upper tropospheric humidity was published online by Theoretical and Applied Climatology. Upper tropospheric humidity is a critical topic in assessing the strength of water vapor feedbacks – knowledge that is essential to understand just how much […]
How many principal components to retain? Recent readers of Climate Audit may not realize that this was an absolute battleground issue of MBH and Wahl and Ammann. In one sense, it was never resolved with MBH back in 2003-2005, but that was before the existence of blogs made it possible to focus attention on problems. […]
While I’m often described as a “statistician”, as that’s a word that people understand (or think that they understand), I think of what I do more as “data analysis”. Academic statisticians are interested in different sorts of things than interest me. I have some styles, habits and practices for approaching new data sets, but they […]
In a story featured on the cover of Nature, Eric J. Steig, David P. Schneider, Scott D. Rutherford, Michael E. Mann, Josefino C. Comiso and Drew T. Shindell report to have found “significant warming” that “extends well beyond the Antarctic Peninsula to cover most of West Antarctica, an area of warming much larger than previously […]
CA reader hfl, who cited Buell’s documentation of the dependence of principal component patterns on shapes, has sent me a scanned pdf version now available here. It concludes by observing that analyses that fail to consider this phenomenon (and there is ample evidence that Steig et al falls into this category) “may well be scientific […]
Nicolas Nierenberg has taken a look here at Gavin Schmidt auditing of McKitrick and Michaels. He previously reported here on the analysis: Anyway I have written an analysis of spatial autocorrelation as it relates to S09 and MM07. My conclusion is that the primary result in MM07 was not affected by spatial autocorrelation, which is […]
Some Japanese articles have been in the news recently. CA readers will be interested in the fact that CA was cited (thanks to a CA reader for the heads up). Here’s a graphic from their SI showing differences between Gaspé versions. As CA readers know, similar discrepancies occur for bristlecones between Ababneh and Graybill or […]
Yesterday, I showed an interesting comparison between the 3 Steig eigenvectors and “Chladni patterns” generated by performing principal components on a grid of spatially autocorrelated sites on a disk. Today I’ll show a similar analysis, but this time using a random sample of points from actual Antarctica. The results are pretty interesting, to say the […]
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