One prediction from models of a chaotically beating heart is the break-up of regular electrical impulses into spirals, causing uneven contractions.

ECONOMIST: Better living through chaos

Argo data, along with satellite and other ocean data, feed into regional and global forecast models used for ocean and climate prediction over seasons, years, and decades.

UNESCO: World Water Assessment Programme (WWAP)

In statistics, the coefficient of determination, denoted R2 and pronounced R squared, is used in the context of statistical models whose main purpose is the prediction of future outcomes on the basis of other related information.

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In my field we have scores of models that are extremely good at explanation but which fail at prediction because some tiny parameter has been left out.

FORBES: Why Skepticism About Computer Models Is Not A Good Reason For Skepticism About Climate Change

Until recently, for a chance of rain of 30%, the Weather Channel's weather.com had shown icons of rain, which for users who don't look at percentages will look like a prediction of wet weather even though the firm's computer models predict that seven out of 10 times on similar days, there will be no rain.

WSJ: Some Percentages Are Just Fair-Weather Friends