\begin{tabular}{l*{5}{c}} 
\\[-1.8ex]\hline \hline \\[-1.8ex] 
& \multicolumn{1}{c}{Uncorrected} & 
\multicolumn{1}{c}{Robust} & 
\multicolumn{1}{c}{HC2} & 
\multicolumn{1}{c}{Clustered} & 
\multicolumn{1}{c}{Bootstrap} 
\\ \midrule
\midrule
\hspace{0.1cm} CA $(=1)$&       3.537\sym{***}&       3.537\sym{***}&       3.537\sym{***}&       3.537\sym{***}&       3.537\sym{**} \\
                    &     (0.964)         &     (0.998)         &     (1.097)         &     (1.368)         &     (1.533)         \\
\midrule
Observations        &        3827         &        3827         &        3827         &        3827         &        3827         \\
\hline \hline \\[-1.8ex] 
\multicolumn{6}{p{\linewidth}}{\small 
\noindent \textit{Note}: Dependent variable 
is log maize yield. CA instrumented with 
wardNGO. Bootstrap uses 1,000 reps. 
* p$<$0.10, ** p$<$0.05, *** p$<$0.01.} 
\end{tabular}
