\begin{tabular}{l*{7}{c}} 
\\[-1.8ex]\hline \hline \\[-1.8ex] 
& \multicolumn{1}{c}{Uncorr.} & 
\multicolumn{1}{c}{Robust} & 
\multicolumn{1}{c}{HC2} & 
\multicolumn{1}{c}{Cluster} & 
\multicolumn{1}{c}{Boot} & 
\multicolumn{1}{c}{Ward} & 
\multicolumn{1}{c}{WCB} 
\\ \midrule
\midrule
\hspace{0.1cm} CA $(=1)$&       3.537\sym{***}&       3.537\sym{***}&       3.537\sym{***}&       3.537\sym{***}&       3.537\sym{**} &       3.537         &       3.537         \\
                    &     (0.964)         &     (0.998)         &     (1.097)         &     (1.368)         &     (1.533)         &     (2.950)         &     (2.950)         \\
\midrule
Observations        &        3827         &        3827         &        3827         &        3827         &        3827         &        3827         &        3827         \\
\hline \hline \\[-1.8ex] 
\multicolumn{8}{p{\linewidth}}{\small 
\noindent \textit{Note}: Dependent variable 
is log maize yield. CA instrumented with 
wardNGO. 
* p$<$0.10, ** p$<$0.05, *** p$<$0.01.} 
\end{tabular}
