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 FAQ:如何拟合函数Y=aX1+bX2？		  New Topic  Reply to Topic
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yuki_wu

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Posted - 05/16/2016 :  05:42:38 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Q： 如何拟合函数形如Y=aX1+bX2+……？
A：
1.如果函数是非线性函数，则可执行：
i.选择菜单栏中的Tools: Fitting Function Organizer打开Fitting Function Organizer窗口，定义新公式

ii.激活数据列（Y），选择菜单栏：Analysis: Fitting: Non-linear Curve Fit
iii.选项卡Settings: Function Selection，选择自定义的拟合函数
iv.Data Selection，选择数据范围
v.选项卡Parameters Tab：定义拟合初值
vi.点击Fit后即可完成拟合

详细操作可参考教程：http://www.originlab.com/doc/Tutorials/Fitting-MultiIndepVar


2.如果函数是线性函数，则可执行：
i.选择菜单栏Analysis: Fitting: Multiple Linear Regression
ii.在Multiple Linear Regression窗口中选择拟合的数据范围及拟合选项，点击OK后即可完成拟合。

详细的各拟合选项的含义可参考：http://www.originlab.com/doc/Origin-Help/Multi-Regression-Dialog
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