Another reason for apparent errors in ice extent is that the data are averaged over an area of 25 kilometers by 25 kilometers (16 by 16 miles). (nsidc.org)
Material from Bradley has been mixed up with apparent errors and distortions of unknown provenance. (deepclimate.org)
Meanwhile, two biostatisticians at MD Anderson Cancer Center in Houston, Texas, Keith Baggerly and Kevin Coombes, found apparent errors in the Nature Medicine paper and related publications and published a critique in September 2009. (sciencemag.org)