1.2.2 Verbal Ambiguity and Numerical Uncertainty

Course subject(s) Module 1. When and how to use SEJ?

We hope that by now it is clear why uncertainty quantification is imperative.

Consider 2 more scenarios and quantify the uncertainty expressed verbally.

Recall the IPCC links from verbal uncertainty to the likelihood of occurrence

Virtually certain – >99%
Very likely – >90%
Likely- >66%
About as likely as not – 33 to 66%
Unlikely – less than 33%
Very unlikely – less than 10%
Exceptionally unlikely – less than 1%.

“Climate change” by liffranolivier is licensed under CC PDM 1.0

Consider the following comment from researcher Tegmark and Borstrom (2005):
“We have shown that life on our planet is highly unlikely to be annihilated by an exogenous catastrophe during the next 109 years.”

Citation: Tegmark, M., and Bostrom, N. (2005). How unlikely is a doomsday catastrophe? arXiv preprint astro-ph/0512204.

How about this statement from Makortoff (2019), “The Channel Tunnel operator has said a no-deal Brexit is very likely so it warned that annual profits will come in at the lower end of forecasts”, published in the Guardian Daily?

Citation: Makortoff, K. (2019).  Channel Tunnel group says no-deal Brexit ‘very likely’.

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Decision Making Under Uncertainty: Introduction to Structured Expert Judgment by TU Delft OpenCourseWare is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Based on a work at https://online-learning.tudelft.nl/courses/decision-making-under-uncertainty-introduction-to-structured-expert-judgment//.
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