\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{Logit - Main Effects (No Fixed Effects): Difference-in-Differences \label{maineff8:did}}
\begin{tabular}{l*{2}{c}}
\hline\hline
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}\\
                    &\multicolumn{1}{c}{Base}&\multicolumn{1}{c}{Full}\\
                    &        b/se   &        b/se   \\
\hline
\hline
Exporters vs. Import-Competing              &       0.560   &       0.580   \\
             &       (.25)   &       (.24)   \\
exim_p              &       0.020   &       0.010   \\
Exporters vs. Non-Traders              &       0.740   &       0.850   \\
             &       (.21)   &       (.21)   \\
exno_p              &       0.000   &       0.000   \\
Exporters vs. Public              &       0.630   &       0.820   \\
             &       (.23)   &       (.24)   \\
expu_p              &       0.010   &       0.000   \\
Import-Competing vs. Non-Traders              &       0.180   &       0.260   \\
             &       (.26)   &       (.24)   \\
imno_p              &       0.500   &       0.280   \\
Import-Competing vs. Public              &       0.070   &       0.230   \\
             &       (.25)   &       (.27)   \\
impu_p              &       0.770   &       0.380   \\
Non-Traders vs. Public              &      -0.100   &      -0.030   \\
             &       (.22)   &       (.25)   \\
nopu_p              &       0.640   &       0.910   \\
\hline\hline
\multicolumn{3}{l}{\footnotesize * p<.1, ** p<.05, *** p<.01}\\
\end{tabular}
\end{table}
