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\begin{document}

\begin{center}
\LARGE{\textbf{Supplementary Appendix for ``Estimating the Causal Effects of Social Interaction with Endogenous Networks''}}
\end{center}

\vspace{0.2in}

\noindent Citation: Rogowski, Jon C.\ and Betsy Sinclair. 2012. ``Estimating the Causal Effects of Social Interaction with Endogenous Networks.'' \emph{Political Analysis} 20: XXX-XXX.

\vspace{0.5in}




\begin{table}[H]
\begin{center}
Table A-1: Office Proximity and Roll Call Voting Behavior: Subsets of Votes
\begin{tabular}{lD{.}{.}{1.2}D{.}{.}{1.2}D{.}{.}{1.2}}
 \toprule
 Independent Variables  & \multicolumn{3}{c}{First 150 Votes}  \\
 & \multicolumn{0}{c}{(1)}  & \multicolumn{0}{c}{(2)} & \multicolumn{0}{c}{(3)} \\
  \midrule
Same building & 0.04 & & \\
& (0.06) & &  \\ [\defaultaddspace]
Same floor & & 0.03 & \\
 & & (0.04) &  \\ [\defaultaddspace]
Same wing & & & 0.08 \\
& & & (0.13)  \\ [\defaultaddspace]
Ideological similarity & -0.68 & -0.68 & -0.68 \\
& (0.10) & (0.10) & (0.10) \\ [\defaultaddspace]
Same party & 0.61 & 0.61 & 0.61 \\
& (0.02) & (0.02) & (0.02) \\ [\defaultaddspace]
Same state & 0.02 & 0.02 & 0.02 \\
& (0.01) & (0.01) & (0.01) \\ [\defaultaddspace]
(Constant) & -0.74 & -0.73 & -0.72 \\
& (0.04) & (0.02) & (0.02)  \\
\midrule
N & \multicolumn{0}{c}{11599} & \multicolumn{0}{c}{11599} & \multicolumn{0}{c}{11599}\\
MSE & 0.18 & 0.18 & 0.18 \\
Congress fixed effects & \multicolumn{0}{c}{Yes} & \multicolumn{0}{c}{Yes} & \multicolumn{0}{c}{Yes}  \\
Clusters & \multicolumn{0}{c}{403} & \multicolumn{0}{c}{403} & \multicolumn{0}{c}{403} \\
\bottomrule
\end{tabular}
\label{tab:rcresults2}
\end{center}
\begin{footnotesize}
\vspace{-0.10in}
Entries are second stage coefficients and clustered standard errors from instrumental variables estimation.  The dependent variable is the logged agreement rate for the first 150 roll call votes of the term.\\
\end{footnotesize}
\end{table} 

\newpage

\begin{table}[H]
\begin{center}
Table A-2: The Effects of Office Proximity Among ``Compliers''
\scalebox{0.7}{
\begin{tabular}{lD{.}{.}{-1.2}D{.}{.}{-1.2}D{.}{.}{-1.2}D{.}{.}{-1.2}cD{.}{.}{-1.2}D{.}{.}{-1.2}D{.}{.}{-1.2}D{.}{.}{-1.2}}
 \toprule
Office Proximity Measure & \multicolumn{4}{c}{Roll Call Agreement Rates}  & \phantom{abc} & \multicolumn{4}{c}{Mutual Cosponsorship Rates} \\
 \cmidrule{2-5}  \cmidrule{7-10}
 & \multicolumn{1}{c}{Lowest 20\%} & \multicolumn{1}{c}{Lowest 30\%} & \multicolumn{1}{c}{Lowest 40\%} & \multicolumn{1}{c}{Lowest 50\%} & & \multicolumn{1}{c}{Lowest 20\%} & \multicolumn{1}{c}{Lowest 30\%} & \multicolumn{1}{c}{Lowest 40\%} & \multicolumn{1}{c}{Lowest 50\%} \\
 \midrule
Same building & -1.01 & -0.01 & -0.19 & -0.28 & & 0.34 & 0.78 & 0.51 & -0.31 \\
& (2.82) & (0.35) & (0.51) & (0.35) &  & (1.02) & (1.15) & (1.17) & (0.57)\\ [\defaultaddspace]
Same floor & -0.24 & -0.00 & -0.08 & -0.13 & & 0.17 & 0.57 & 0.27 & -0.26 \\ 
& (0.35) & (0.20) & (0.19) & (0.14) & & (0.42) & (0.64) & (0.60) & (0.44) \\ [\defaultaddspace]
Same wing & -1.37 & -0.01 & -0.26 & -0.28 & & 0.36 & 0.72 & 0.45 & -0.38 \\
& (2.66) & (0.55) & (0.65) & (0.30) & & (0.91) & (0.82) & (1.03) & (0.65) \\ [\defaultaddspace]
\midrule
N & \multicolumn{1}{c}{369} & \multicolumn{1}{c}{857} & \multicolumn{1}{c}{1378} & \multicolumn{1}{c}{2090} & & \multicolumn{1}{c}{209} & \multicolumn{1}{c}{484} & \multicolumn{1}{c}{785} & \multicolumn{1}{c}{1207}\\ 
\bottomrule
\end{tabular}}
\label{tab:late}
\end{center}
\vspace{-0.10in}
\begin{footnotesize}
\indent Each column of entries represents the second stage estimates for the effect of office proximity among legislators who drew lottery numbers in the lowest 20\%, 30\%, 40\%, or 50\% of their incoming cohort. Entries are coefficients and clustered standard errors estimated via instrumental variables using the same models shown in tables 4 (roll call behavior) and 6 (cosponsorship behavior). 
\end{footnotesize}
\end{table}     

\newpage

\begin{table}[H]
\begin{center}
Table A-3: Office Changers and Voting Behavior in the 110th and 111th House
\begin{tabular}{lD{.}{.}{1.2}D{.}{.}{1.2}}
 \toprule
 Independent Variables  & \multicolumn{0}{c}{Roll Calls} &  \multicolumn{0}{c}{Roll Calls}\\
  \midrule
Building change & 0.27 & 0.01 \\
& (0.07) & (0.00) \\ [\defaultaddspace]
Agreement, 110th House & -0.15 & -0.15 \\
& (0.02) & (0.07) \\ [\defaultaddspace]
(Constant) & 15.86 & -1.25  \\
& (0.93) & (0.05)  \\
\midrule
N & \multicolumn{0}{c}{64261} & \multicolumn{0}{c}{64261} \\
$R^2$ & 0.20 & 0.08  \\
MSE & 4.37 & 0.18 \\
Clusters & \multicolumn{0}{c}{359} & \multicolumn{0}{c}{359} \\
\bottomrule
\end{tabular}
\label{tab:change}
\end{center}
\begin{footnotesize}
\vspace{-0.10in}
Entries are linear regression coefficients and clustered standard errors.  The dependent variable in column 1 is ($agreement_{111}$ - $agreement_{110}$), and the dependent variable in column 2 is \emph{ln}($agreement_{111}$ - $agreement_{110}$ + 0.24).\\
\end{footnotesize}
\end{table} 


\newpage

\begin{table}[H]
\begin{center}
Table A-4: Office Proximity and Legislative Behavior in the 105th House
\scalebox{0.9}{
\begin{tabular}{lD{.}{.}{1.2}D{.}{.}{1.2}}
 \toprule
 Independent Variables  & \multicolumn{1}{c}{Roll Calls} & \multicolumn{1}{c}{Cosponsorship} \\
  \midrule
Same building & 0.78 & 2.59 \\
& (0.20)  & (0.71)  \\ [\defaultaddspace]
Ideological similarity & -0.75 &   -0.97 \\
(Presidential vote share) & (0.06) &  (0.09)  \\ [\defaultaddspace]
Same party & 33.53 & 57.22   \\
& (0.91)  & (1.91)  \\ [\defaultaddspace]
Same state & -0.38 & 34.59  \\
& (0.92)  & (2.56) \\ [\defaultaddspace]
Year served together & -6.58  & -1.95 \\
(decades) & (1.66)  & (2.22)\\ [\defaultaddspace]
Same cohort & 3.24  & 5.85  \\
& (0.82) &  (1.34)  \\ [\defaultaddspace]
Same religion & -2.05  & 4.04  \\
& (0.58) &  (1.80)  \\ [\defaultaddspace]
Both female & -0.98  & 9.57  \\
& (1.15) &  (1.90)  \\ [\defaultaddspace]
Both black & -2.31  & 9.54  \\
& (1.10) &  (2.84)  \\ [\defaultaddspace]
Both Latino & -3.39  & 5.46  \\
& (1.53) &  (5.73)  \\ [\defaultaddspace]
Both Asian American & 3.42 & 34.01\\
& (3.45) & (21.82)\\ [\defaultaddspace]
Same college & 0.70  & 2.77  \\
& (0.74) &  (1.67)  \\ [\defaultaddspace]
Agricultural district & 41.55  & 7.50  \\
& (22.65) &  (18.52)  \\ [\defaultaddspace]
Military district & -20.33  & -11.96  \\
& (11.81) &  (13.31)  \\ [\defaultaddspace]
Shared military service & 1.78  & 0.25  \\
& (1.01) &  (0.81)  \\ [\defaultaddspace]
Same committee & 2.80  &9.09  \\
& (0.94) &  (1.03)  \\ [\defaultaddspace]
(Constant) & -95.49 &  -536.03 \\
& (0.77)  & (2.54) \\
\midrule
N & \multicolumn{0}{c}{90525} &  \multicolumn{0}{c}{90525} \\
MSE & 23.68 &  57.13 \\
Clusters & \multicolumn{0}{c}{425}  & \multicolumn{0}{c}{425}\\
\bottomrule
\end{tabular}}
\label{tab:105}
\end{center}
\begin{footnotesize}
\vspace{-0.10in}
Entries are linear regression coefficients and clustered standard errors.  The dependent variable in the first column is the logged roll call agreement rate (in percentage points), and the dependent variable in the second column is the logged cosponsorship agreement rate (in percentage points).\\
\end{footnotesize}
\end{table} 

\end{document}
