They define weak and strong safe haven behaviors based on moderate and high statistical confidence in crash protection, respectively. (cxoadvisory.com)
It can therefore be challenging to build statistical confidence in observed trends, especially over short time periods. (dotearth.blogs.nytimes.com)
We certainly do know what we are talking about, usually to a very high degree of quantifiable statistical confidence, but never to certainty. (unsettledclimate.org)