What is centering? Averaging the temperatures for a centerline on a graph or is it more involved?
Also what does this mean, “MBH98 did not use archived data, but made an extrapolation, unique within the corpus of over 350 series, and misrepresented the start date of the series. ”? Is he saying that they didn’t have data for some important subsection of date ranges and made it up statistically and dishonesty?
It sounds like one “confirming” study used a poor choice of tree species and another did the above, making up holes in the data incorrectly.
I missed the criticism of the original study in the discussion section. I’d dig into the heart of the study myself, but it would be a half day project for me, and I don’t have that kind of time. If you don’t have time either to translate, I understand. Regards.
I think the "centerline" deals with finding a temp at the beginning and one at the end.. that is then used to establish a "linear" progression, i.e., a straight line temp rise or fall..
Then the graphed temps are overlayed, using the centerline as some sort of median point of reference.. ( median as opposed to average.. )
MBH98 I think was the "bristlecone pine" data..
While they had 350 other series of tree ring data, for a set period of time, MBH98 did not.. so, Mann "made up" data for that series.. over a time period for which data did not exist..
In doing so, Mann ruined the calculations used to derive his data, corrupting all resultant conclusions..
In essence, "discussion" criticized Mann for faking data..
It then criticized those that accepted said data at face value, without doing any peer review, or attempting to check out the facts..