Doug1o29, on 30 October 2012 - 12:41 PM, said:
The libel suit and Nobel Prize are side issues. The key question is: has the "hockey stick" been disproven? To answer that, one needs to be very specific: exactly what did Mann do wrong? If he used bad data, they need to say which data sets were bad. If he made a processing mistake, they need to say exactly what it was.
It is possible that a few years from now, I may be checking Mann's work by carrying out a similar project for a different set of proxies - that both double-checks the previous work and extends the knowledge base. If Mann made mistakes, I need to know what they are so I don't repeat them. Little Fish et al. could do me and science a real favor by naming the specific problems in Mann's study.
Doug
He will just point you to the MM paper without any understanding of what he is doing. MM pointed out many minor errors which were subsequently corrected and incorporated into the subsequent reanalysis, since then there has been nothing of substance which has questioned the validity of Manns work and the criticism has boiled down to unverified claims of academic fraud with no specifics supplied.
As a trained statistician you would be the best person to make the judgement call on whether the chosen statistical analysis was appropriate to the data. My understanding would be that there is no absolute right answer to this since different methods will produce slightly different result - all equally valid within their own terms.
The problem that myself, and 99.9% of the public, have is that statistics is an alien territory which operates counter intuitively to simple linear logic. The details of the arguments made against Mann are over the heads of almost everyone and most will find it almost impossible to make meaningful value judgments about what is significant. That is why we can only fall back on peer review and the opinion of expert statisticians (who have looked at the work and found it valid). Unfortunately the likes of MM are highly politically motivated and so set out to specifically deceive their target audience to satisfy the needs of their paymasters and their political ends.
The point of the main complainants is that they never made or intended to make specific verifiable claims about Manns work, their sole intention was to undermine confidence in the Hockey stick and climate science in general. In this respect the more general and none specific your criticism's the better - because their validity can never be tested in any meaningful scientific way.
Ultimately the point is that the hockey stick graph has been reproduced at least 10 times by different teams using different datasets and different methodologies. Unless you subscribe to the Grand Conspiracy way of look at this, that is fairly conclusive verification that Mann was right from the start.
Br Cornelius
Edited by Br Cornelius, 30 October 2012 - 02:03 PM.
I believe nothing, but I have my suspicions.
Robert Anton Wilson