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16 July 2012

Comments

Silverlocust

Andy, your statement that only "only 77 chose to answer the online survey (yes, only 77)" is incorrect. In fact, you include a bar graph that demonstrates your error.
The survey was sent to 10,257 scientists and was responded to by 3,146. The figure of 77 is the number of regularly publishing climate scientists that the researchers gleaned from the respondents. True, not a very representative figure.
A far more rigorous (in both sampling and questioning) and more recent survey was conducted by a group from the US National Academy of Scientists. From a database of 1,372 climate scientists, they gleaned 908 who had authored at least 20 publications concerned with climate science (and therefore of high expertise).
Of those, 97-98% "support the tenets of anthropogenic climate change" as stated by the IPCC.
A link to that report is here >>
http://www.pnas.org/content/early/2010/06/04/1003187107.full.pdf

Fredfighter

If 'Andy' is right as to these numbers:

10257 surveyed (population)
77 responded (sample size)
75 of responses were in the affirmative

Then statistics tells us that the probability is 97.5% that more than 93% of the climate scientists (e.g. more than 9500 of the 10257) are in agreement with the survey, right?

So THAT is really what should have been reported, thought he most probably number is 97%.

--

FF

JMH

Keep the pressure applied, Andy.

I have been lurking for some time but took the plunge today just to let you know I really like your blog.

Steve and Larry's cartoons have been spot on.

JMH

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