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RegEM
RegEM has reared its ugly head again in Mann’s review of Burger and Cubasch. An EM algorithm was one of the very first things that I tried when I started doing this a couple of years ago. When I tried...
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More on "Naturally Orthogonal"
I realize that not all CA readers are interested in multivariate methods and that dendroclimatologists want to “forget the math”, but I find it interesting to try to relate dendro and paleoclimate...
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Re-Visiting RegEM: Rutherford et al 2005
Mann et al 2007 is a new RegEM version, replacing the RegEM calculations of Rutherford et al 2005. The logic is not entirely self-contained and so I re-visited some of our previous comments on...
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Smerdon et al 2008 on RegEM
Smerdon et al 2008 is an interesting article on RegEM, continuing a series of exchanges between Smerdon and the Mann group that has been going on for a couple of years. We haven’t spent much time here...
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RegEM PTTLS Ported to R
I’ve now ported my emulation of Schneider’s RegEM PTTLS to R and benchmarked it against Jeff’s Matlab as shown below. I caution readers that this is just an algorithm. There are other ways of doing...
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TTLS in a Steig Context
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...
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Speculating Privately
Iridge versus TTLS. What if a key text on this conundrum of the day resided in an anonymous open peer review? Would we, within the ethical standards of modern climate science, be entitled to speculate...
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