When the objective matters are studied by models, the forecasting results obtained by perfectfitting will not necessarily be very good. In this paper, the causes of error produced are analyzed.
借助于模型研究客观事物时，好的拟合得到的预测不一定很好，本文分析了产生误差的原因。
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Fitting was a matter of continuous checking and swift, soft planing; only one stroke of a plane, he would say, separated a perfect drawer from a sloppy one.