By Dr. Tim Ball – Re-Blogged From WUWT
A fascinating 2006 paper by Essex, McKitrick, and Andresen asked, “Does a Global Temperature Exist.” Their introduction sets the scene,
It arises from projecting a sampling of the fluctuating temperature field of the Earth onto a single number (e.g. , ) at discrete monthly or annual intervals. Proponents claim that this statistic represents a measurement of the annual global temperature to an accuracy of ±0.05 ◦C (see ). Moreover, they presume that small changes in it, up or down, have direct and unequivocal physical meaning.
The word “sampling” is important because, statistically, a sample has to be representative of a population. There is no way that a sampling