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船舶横摇运动是对船舶航行影响最大的运动，研究船舶横摇运动的建模与预报对于提高船舶适航性、耐波性有重要意义。
Because ship rolling is the heaviest motion of a ship in waves, it is important to study ship rolling modeling and prediction in order to improve ship's seaworthiness and wave-resistance.
实例分析表明：优选出的样本保留了全部样本的大部分信息；用优选出的因子建模可达到与用全部因子建模相近的拟合和预报效果。
The analysis of examples shows that after optimization the samples maintain the most information and the modelling of factors has the close effects.
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