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 FAQ：拟合时如何处理偏离点？		  New Topic  Reply to Topic
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yuki_wu

896 Posts
Posted - 05/17/2016 :  03:22:45 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
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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