Month: September 2014

September 29, 2014 0

Zombie Steve and the Hockey Stick

By News Desk

toto said… My understanding is that "short-centering" was actually a bona-fide bug. If you’re computing a covariance matrix by simply multiplying the data with its own inverse, "short-centering" the data around the recent past will produce "fake covariance" of all series with the hockey-stickish series (with a negative sign, but that’s irrelevant).The actual PCs being computed are the same, but the ‘hockey-stickish’ ones now seem to explain much more of the variance – spuriously so.Unfortunately the auditor-in-chief proceeded to introduce a bug of his own, by keeping the same number of PCs as Mann after full-centering the matrix, even though by then you need to include more PCs to capture sufficient variance

September 28, 2014 0

Upsides Down and Backwards

By News Desk

Tweet Nick Stokes has his teeth into the hockey stick for a while.  Back in 2011 he explored Deep Climate’s exposure of the Wegman hanky panky, Nick found that if you didn’t do the cherry pick the results were much less hockey stick like for decentered PCs Then this March Nick explaned how McIntyre and McKitrick effectively truncated the Gaspe cedar series by fifty years, leaving, well not very much or really not very much global data for 1400-1450.   MBH had padded out that series from its end in 1404 by persistence, but a Steve McIntyre relied on a narrow reading (and Steve McIntyre is famed for such) of MBH 98 to justify that step, except they were very legalistic in not clearly explaining what they had done, until Nick Stokes worked his way through the thicket

September 28, 2014 0

Reflections on Catalonia, Crimea, Iraq, California, Nation Building

By News Desk

A Gallup Poll in Crimea following the referendum shows overwhelming support. More than eight in 10 (82.8%) say the referendum reflects most Crimeans’ views. About three-fourths of Crimeans (73.9%) say Crimea’s becoming part of Russia will make life better for themselves and their families, just 5.5% disagree