I could be mistaken, but I think there is a typo in the documentation related to the Driscoll-Kraay estimator.
It should be \hat{\Gamma}_{i} instead of \hat{\Gamma}_{1}.
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\hat{S}_{HAC} & =\hat{\Gamma}_{0}+\sum_{i=1}^{bw}K(i,bw)(\hat{\Gamma}_{1}+\hat{\Gamma}_{1}^{\prime})\\
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I could be mistaken, but I think there is a typo in the documentation related to the Driscoll-Kraay estimator.
It should be
\hat{\Gamma}_{i}instead of\hat{\Gamma}_{1}.linearmodels/doc/source/panel/mathematical-detail.txt
Line 238 in facba92