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Update correlation in ksqfit.
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lsqfit.md

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@@ -263,3 +263,7 @@ def joint_fit(ratio):
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print(fit.format(maxline=True))
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fit_y = fit.fcn(x, fit.p)
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```
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> **Note:** 关联问题:联合拟合中存在的关联有两方面,
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> - 拟合对象 $Y$ 的关联。对于 $Y_i \in Y$ 一般是带有关联矩阵的输入量,比如是从 `gv.dataset.avg_data` 拿到的关联。
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> - 拟合后给出的参数 `fit.p` 中存在关联,可以通过 `print(fit.cov)` 查看参数之间的关联。

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