Homogenisation is the root of all evil
Jul 17, 2012
Bishop Hill in Climate: Statistics, Climate: Surface

Well, something like that anyway. Anthony Watts is reporting a presentation by Demetris Koutsoyiannis, which finds that many of the homegenisation adjustments applied to surface temperature data are ill-founded.

Homogenization practices used until today are mainly statistical, not well justified by experiments and are rarely supported by metadata. It can be argued that they often lead to false results: natural features of hydroclimatic time series are regarded [as] errors and are adjusted.

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