In effect, a matrix of difference series is formed for a large fraction of all possible combinations of station series pairs in each localized region. (climateaudit.org)
In this approach, comparisons are made between numerous combinations of temperature series in a region to identify cases in which there is an abrupt shift in one station series relative to many others. (ncdc.noaa.gov)
First, a series of monthly temperature differences is formed between numerous pairs of station series in a region. (climateaudit.org)