I don't have a clue about meteorology and climate science, but I have some familiarity with data mining and access to large datasets.
There may be good reasons for not offering the whole unfiltered data for public examination. Certainly in the case of medical data the data collection methods and the data representation are not always self explanatory and there can be methodological differences over time that make comparisons/analysis difficult. I do not know how much of that happens with climate data.
Also, datasets are rarely complete. One of the major challenges in interpreting large experimental datasets is figuring out what to do with missing data points.
Simplistic approaches that do not take these complexities into account might give misleading results.
OTOH I do understand the skepticism about non-intuitive results based on data accessible only to the chosen initiates.
?After the firestorm of criticism called Climate-gate, the British government's official Meteorological Office apparently has decided to wave a white flag and surrender.
At a meeting on Monday of about 150 climate scientists in the quiet Turkish seaside resort of Antalya, representatives of the weather office (known in Britain as the Met Office) quietly proposed that the world's climate scientists start all over again on a "grand challenge" to produce a new, common trove of global temperature data that is open to public scrutiny and "rigorous" peer review.
In other words, conduct investigations into modern global warming in a way that the Met Office bureaucrats hope will end the mammoth controversy over world temperature data they collected that has been stirred up by their secretive and erratic ways.?
http://www.foxnews.com/scitech/2010/02/23/britains-weather-office-proposes-climate-gate/
This is the way it should have always been.

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