The effect of forecast is tested by historical data.

用历史资料检验了预报效果。

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Although it is not influence the effect of forecast and predict.

尽管如此，但不影响预测预报结果。

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The effect of forecast using the optimal subset regression method for the date of the first soaking rainfall is good in Ningxia.

利用最优子集回归预报法对宁夏春季首场透雨出现日期的预测具有理想的拟合效果。

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You can gauge the effect of a change in forecast by modifying the charts above.

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In effect, the IMF split the difference last week, with its estimate that fiscal tightening had caused Britain's national output to be 2.5% smaller than it would have been (though the Treasury would claim that some of that effect was incorporated in the original forecast).

BBC: UK GDP: A nasty surprise and a puzzle

It says that the main effect on its forecast is to increase the range of possible outcomes.

ECONOMIST: The Bank of England yanks down its growth forecast