Guest M&M Quotes
But now a shock: Canadian scientists Stephen McIntyre and Ross McKitrick have uncovered a fundamental mathematical flaw in the computer program that was used to produce the hockey stick. In his original publications of the stick, Mann purported to use a standard method known as principal component analysis, or PCA, to find the dominant features in a set of more than 70 different climate records.
Suddenly the hockey stick, the poster-child of the global warming community, turns out to be an artifact of poor mathematics.
– Richard A. Muller
BEST’s slicing methodology, in effect, implements a variation of Menne’s methodology on the larger GHCN data set. (It also introduces a curious reweighting scheme discussed by Jeff Id here.) With a little reflection, I think that it can be seen that the mathematics of Mennian methods will necessarily slightly increase the warming trend in temperature reconstructions from surface data, an effect previously seen with USHCN and now seen with GHCN.
– Steven McIntyre