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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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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The other factor which allows us to make a forecast that whether one year is significantly different from the next is the effect of the El Nino.

另一个因素是‘厄尔尼诺’效应，我们可以据此预测下一年的气候是否会出现异常。

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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).

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

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