Image talk:Hockey stick chart ipcc large.jpg

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Concerns Over Bias of Graph

Presumably the intended purpose of this graph is to demonstrate that independent temperature reconstructions prove the existence of 'hockey sticks' However, of the 10 reconstructions the first 7 are by Mann himself or coauthors or direct collaborators of Mann. And so is reconstruction 9.

Reference here: http://www.climate2003.com/blog/hockey_team.htm

And here: http://www.climateaudit.org/?p=499

Question: Mann’s group’s work surely cannot be used as independent validation of Mann’s work? Should there perhaps be added advisory text warning that the reconstructions are based primarily on Mann's group's work only?

"These curves are a fair representation of the range of results appearing in the published scientific literature."

Question: Can this statement be verified? Where is the citation to support it? Has Mann's and his coauthors and collaborators in fact published 70% of all temperature reconstructions in the published scientific literature?

Question: Are there any composite graphs similar to this available that are not completely dominated by the research work of one particular group of authors, so that better balance may be achieved?

Presumably the intended purpose of this graph is... to present all plausible well-sourced reconstructions. If you know any that have been omitted, be kind enough to list them. And don't trust CA to provide an unbiased view William M. Connolley (talk) 23:46, 14 January 2008 (UTC)

As requested a small selection of alternate reconstructions here:

http://www.climateaudit.org/?p=2393

And also here:

http://www.ncasi.org/Publications/Detail.aspx?id=3025

CA should not be trusted to provide unbiased information any more than Realclimate or any other group. (Double-blind experiments are performed exactly because it is well understood that scientists inevitably introduce bias into their work.) William Connolley please provide links that readers can study that back up your opinions. Although I realise you have some type of connection with Realclimate, which is itself closely aligned with the Mann group, any factual evidence supporting your assertions would still be of potential great interest to most readers. —Preceding unsigned comment added by Will Nitschke (talk • contribs) 23:05, 16 January 2008 (UTC)

Which of my opinions are you looking for a source for? William M. Connolley (talk) 19:14, 18 January 2008 (UTC)