«If you look at the market returns in the preceding year, a higher number of proxy contests tend to happen in years following poor market returns. (canadianlawyermag.com)
The reconstruction all the way back to the year 1400 used 22 proxy data series, although some of the 22 were combinations of larger numbers of proxy series by a method known as «principal components analysis» (hereafter called «PCA» — see here). (realclimate.org)
The study uses a large number of proxy data sets to create a global temperature mean they call G7 spanning the last 2000 years. (climatethetruth.com)