This paper aims at discussing the value range of combination forecasting error square sum with matrix theory.

应用矩阵理论，对组合预测误差平方和的取值范围进行了研究。

youdao

The results indicate that the relative monitoring error is about 10%, and the relative risk forecasting error is about 20%.

从近年在河北省冬麦区土壤水分的监测预测结果来看，监测相对误差在10%左右，风险预测相对误差在20%左右。

youdao

Mr. Greenspan's confidence in the resilience of home prices -- shared by most in the industry at the time -- became a critical forecasting error.

格林斯潘对房价弹性的信心成了关键的预判错误，不过当时业内大多数人士都这么认为。

youdao

This forecasting error was at least understandable since the dotcom boom was an exceptional episode, but the chancellor then started to bank on this buoyancy continuing.

ECONOMIST: Britain's budget

Of course, the financial crisis explains this massive forecasting error, but the study finds that relatively little was due to fiscal stimulus programmes in response to the downturn.

BBC: Debt and the crisis: How did governments get it so wrong?

Many thanks to Mike Cowan (author of the Cowan LRA Forecasting Model) for pointing out an error in a prior version of this post, and for providing the numbers behind the chart.

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