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 FAQ:拟合时如何处理偏离点?

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T O P I C    R E V I E W
yuki_wu Posted - 05/17/2016 : 03:22:45 AM
Q:用户进行曲线拟合时,如何处理明显偏离趋势的数据点呢?

A:用户屏蔽(Mask)或者对数据点加权重:

1.若需屏蔽某数据点,可执行:
i.单击选择曲线,当曲线被激活后,单击选择偏离趋势的数据点;
ii.右键选择Mask,数据点变为红色即表明数据点被屏蔽;
iii.在执行拟合操作时,该屏蔽点即会被忽略。





2.若需为数据增加权重,可执行:
i.在数据所在的worksheet增加一列,然后键入各数据点对应的权重;
ii.对于Linear Fit,可在选项卡Input的Y Error中选择权重值,然后在选项卡Fit Control中选择加权方式。





iii.对于Nonlinear Curve Fit,可在选项卡Setting:Data Selection中Input的y展开项中选择权重值和加权方式



关于加权方式的选择详细可参考:http://www.originlab.com/doc/Origin-Help/FIt-with-Err-Weight

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