[quote]Bill Roberts wrote:
You always have to analyze whether your being-considered substitutions could introduce error, could introduce systematic bias, or whether you are discarding direct comparisons for indirect ones, and if the latter you need to make this clear. You also need to see why you must make the substitution or omission if it is not necessary to do so, and must make sure that there is no bias introduced or unnecessary arbitrariness. There is no doubt that these principles were not followed. Very obviously these eliminations of vast amounts of data sources that had been included in prior years are unnecessary eliminations which can introduce bias and have unnecessary arbitrariness.
As for your claim that urban effects are compensated for: it is not credible that the best way, when having a very large number of stations that you could use and in fact used to use in a multiplicity of points much better representing the Earth as a whole, is to instead use a far smaller number of urban stations and perform a manipulation on that data. Particularly when comparing to a timepoint when you did NOT do that but did use these other stations, and claiming a difference between the timepoints.
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Agreed, after a fashion. Obviously, the more data the better, assuming that it is all robust. However, while some rural stations have been gotten rid of, it’s not like they’re using NYC data to model North Dakota. Probably the best thing to do to check the model is to apply it to old data sets, and see whether
- The interpolated data matches the actual data at these locations
- There exists a warming effect based on the trend between the interpolated data sets.
Also, for what it’s worth:
http://data.giss.nasa.gov/gistemp/
[quote]From that site:
In step 1, if there are multiple records at a given location, these are combined into one record; in step 2, the urban and peri-urban (i.e., other than rural) stations are adjusted so that their long-term trend matches that of the mean of neighboring rural stations. Urban stations without nearby rural stations are dropped.
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[quote]Bill Roberts wrote:
On the satellite data: You don’t seem to have read my meaning as written. I was stating what we are left with at this point. It is not the case that results from the satellite data match the hopelessly-mishandled surface station data. The latter, however, is what has been given more weight.
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Fair enough, bad on me. There was a study (http://www.sciencemag.org/cgi/content/abstract/1114772v1) which noticed orbital drift, which meant that tropical satellites were actually taking readings at night, rather than during the day.
[quote]Bill Roberts wrote:
It is already a known fact that these “scientists” are not only utterly cavalier about whether what they say is true (Glaciergate) but in fact have worked hard to massage out of the data the result they wanted. In the comments field of computer code for their models, notations have been found explaining that a given thing, for example bandpass parameters for a given filtering, have to be done exactly this way to get the desired result. Which is to say, a dramatic finding of warming.
Others, in the illegally deleted e-mails, boasted of clever tricks they had found to bolster the amount of warming that could be claimed. (Yes, I know, they now say that that just meant that the math was great, and supposedly not that they had to try many possible methods to get the result they wanted, and then – of course – went with that method.)
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Glaciergate was horseshit, I’m not going to lie. If you are quoting pop-science magazines (New Scientist) at a UN hearing, you deserve to get burned. However, claiming that CRU tried many methods and went with the one that gave the result they wanted is unfounded.
[quote]Bill Roberts wrote:
You credit people like this when unnecessarily throwing out all these weather stations in naturally colder places of being certain to exactly compensate for this, if that were even possible to do with certainty? I don’t. Even if they did try honestly, it would be horrible science. Given what we have learned lately, it’s unreasonable to assume with confidence they worked to avoid introducing bias in favor of their desired outcome.
But even if we granted that they did, it would be horribly and unnecessarily bad science – just downright stupid actually – compared to using the data that they are choosing not to use, but which used to be included.
If we’re talking about one individual, downright stupid things can happen without fraudulent intent. This could even be the case with a small group. Stupidity can be contagious sometimes, or a group may have coalesced around each other precisely because they all are stupid, and better scientists avoided them for that reason.
But when it’s this many? No. Something like this cannot have been done simply out of not knowing better.[/quote]
So it is more plausible that virtually every climatologist got together and agreed that they were going to commit mass scientific fraud and dupe the entire world? Maybe, but it seems unlikely.