Archives For uncertainty

The IPCC issued a set of lead author guidance notes on how to describe uncertainty prior to the fourth IPCC assessment. In it the IPCC laid out a methodology on how to deal with various classes of uncertainty. Unforunately the IPCC guidance also fell into a fatal trap.

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The Newcastle 2007 storm

The truth is incontrovertible

According to Drew Warne Smith and James Madden writing in the Nov 7th edition of the Australian:

 “The science is in on sea-level rise: 1.7 mm” , …we don’t need to worry about sea level rises in Australia as a ‘scientific’ 1.7 mm rise is a third less than the government’s overheated predictions…

How Smith and Madden set out to construct a case that government predicted sea level rises are exaggerated provides an excellent example of how fallacious arguments can be used to misinform the unwary, and in this case skew the reader’s perception of risk. Continue Reading…

If you read through the International Panel on Climate Change (IPCC) reports you’ll strike qualitative phrases such as’likely’ and ‘high confidence’ to describe uncertainty. But is there a credible basis for these terms?

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Risk - what is it?

The continuum of uncertainty

What do an eighteenth century mathematician and a twentieth century US Secretary of Defence have to do with engineering and risk? The answer is that both thought about uncertainty and risk, and the differing definitions that they arrived at neatly illustrate that there is more to the concept of risk than just likelihood multiplied by consequence. Which in turn has significant implications for engineering risk management.

Editorial note. I’ve pretty much completely revised this post since the original, hope you like it

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