\section{ARRAU3: Statistics and Availability}

% \todo{Include table with differences between {\ARRAU} 2 and {\ARRAU} 3 like Tables 1, 2 .. and 8 in Uryupina et al}


\begin{table*}
%\scriptsize
%\small
 \begin{center}
\begin{tabular}{ll|r|r|r|r|r|r|r|r|r}
\toprule
 \multicolumn{1}{l}{} & & 
   \multicolumn{3}{c|}{ARRAU1} &
     \multicolumn{3}{c|}{ARRAU2} &
       \multicolumn{3}{c}{ARRAU3} \\
 \multicolumn{1}{l}{} & & 
   \textbf{DC}  & \textbf{TK} & \textbf{MK} & 
     \textbf{DC}  & \textbf{TK} & \textbf{MK} & 
      \textbf{DC}  & \textbf{TK} & \textbf{MK} \\
\midrule
       & train&  &  &  &  
                  335  & 182031 & 57686 &  
                    333 & 182424 & 57489\\
{\RST} & dev  &  &  &  &
                18  & 12845 & 3986 &  
                  18 & 12845 & 3962 \\
       & test &  &  &  &  
                60 &  33225 & 10341 &  
                  60  &  33225 & 10319 \\ 
       & overall & 204 & 146512 & 45990 
                   & 413 & 228901 & 72013 & 
                       411 & 228494 & 71770 \\ 
\midrule
{\TRAINS} & 91 &  &  &  &
                  16 & 14496 & 2884 & 
                    16 & 14496 &3706\\
          & 93 &  &  &  & 
                  98 & 69158 & 14115 & 
                    98  &  69158 & 17262\\
          & overall & 35& 25783& 5198& 
                    114 & 83654 & 16999 & 
                      114 & 83654 & 20968 \\
\midrule
{\PEAR}   &    &  20&14059& 3881& 
                   20 & 14059  & 4008 & 
                      20 & 14059  &  4023 \\
 \midrule
{\GNOME}  & 2    & 5 & 21599& 6215 & 
                     5 & 21458 & 6562 & 
                       5 &  21458  &  6571 \\
          & 2001 &   &      &      &   
                        &       &      &
                        8  &  11835     &  3368    \\
          & overall & 5 & 21599& 6215 &
                       5 & 21458 & 6562 &
                        13  &  33293  & 9939 \\
\midrule
\bf Total &         & 264 & 184,748 & 60884 &  
                       552 & 348,072  & 99582 &
                         558 & 359,500 & 106,700\\
\bottomrule
\end{tabular}
\caption{Size comparison between {\ARRAU} 3 and previous releases in terms of documents (DC), tokens (TK), and markables (MK)}
\label{tab:arrau3-stats}
 \end{center}
%\normalsize
\end{table*}

% Cut to save space
% \begin{table*}
% %\scriptsize
% %\small
%  \begin{center}
% \begin{tabular}{ll|rr|rr}
% \toprule
%  \multicolumn{1}{l}{} & & 
%    \multicolumn{2}{c|}{ARRAU2} &
%        \multicolumn{2}{c}{ARRAU3} \\
%  \multicolumn{1}{l}{} & & 
%    \textbf{NR}  & \textbf{DISCO}  & 
%    \textbf{NR}  & \textbf{DISCO}  \\
% \midrule
%        & train& 7609 & 280& 7911 & 287 \\
% {\RST} & dev  &  552 & 14 & 564  &  14 \\
%        & test &  1391& 78 & 1548 &  75 \\ 
%        & overall& 9552&358& 10023& 376 \\ 
% \midrule
% {\TRAINS} & 91      & 382 &  3  &  425 &  14  \\
%           & 93      &1967 &  3  & 2010 &    6 \\
%           & overall & 2549&  6  & 2435 &   20\\
% \midrule
% {\PEAR}   &         & 607 &  1  &  562  &  1 \\
%  \midrule
% {\GNOME}  & 2       &1047 & 83  &  972  &  83 \\
%           & 2001    &     &     &  295  &  0 \\
%           & overall & 1047& 83  &  1267&  83\\ 
% \midrule
% \bf Total &         & 13,555 & 448 & 14,287 & 480 \\
% \bottomrule
% \end{tabular}
% \caption{Non referring and discontinuous markables  in {\ARRAU} 3 and the previous release {\ARRAU} 2.}
% \label{tab:arrau3-markables}
%  \end{center}
% %\normalsize
% \end{table*}

\begin{table*}
%\scriptsize
%\small
 \begin{center}
\begin{tabular}{ll|rrrrr|rrrrr}
\toprule
 \multicolumn{1}{l}{} & & 
   \multicolumn{5}{c|}{ARRAU2} &
       \multicolumn{5}{c}{ARRAU3} \\
 \multicolumn{1}{l}{} & & 
   \textbf{GE}  & \textbf{BG}  & \textbf{DD} & \textbf{SP}  &  \textbf{AMB} & 
   \textbf{GE}  & \textbf{BG}  & \textbf{DD} & \textbf{SP} & \textbf{AMB} \\
\midrule
       & train&  753& 2797	& 496 & 346	& 68 &
                    5149 & 5398	& 578	& 353	& 430 \\
{\RST} & dev  &  198& 277& 36 & 27	&  0 &
                  814	& 431& 49	& 26& 38  \\
       & test &  487 & 703	& 99 & 63 & 14	&
                  907	& 966 & 98 & 69	& 110 \\ 
       & overall& 1438	& 3777 & 631 & 436 & 82	&
                   6870 & 6795 & 725 & 448	& 578   \\ 
\midrule
{\TRAINS} & 91 & 98	& 74 & 154 & 48 & 22 &
                 107	& 176 & 163	& 59 & 168  \\
          & 93 &  635	& 636 & 708	& 182 & 99 & 
                  651 & 1007	& 725 & 257 & 245 \\
          & overall & 733	& 710 & 862 & 230 & 121 &
                  758	& 1183 & 888 & 316 & 413 \\
\midrule
{\PEAR}   &   & 74& 333	& 67 & 30 & 31	& 
                175	& 346 & 71 & 32	& 63\\
 \midrule
{\GNOME}  & 2    & 12	& 692	& 73 & 43 & 16	& 
                   814	& 737	& 74 & 53 & 78\\
          & 2001 &   &    &    &   &   &
                   800	& 396 & 9 & 0	& 11\\
          & overall & 12	& 692 & 73 & 43	& 16 &
                      1614 & 1133 & 83 & 53 & 89 \\ 
\midrule
\bf Total &       &  2257 & 5512 & 1633	& 739 & 250	&
                     9417 & 9457	& 1767 & 849 & 1143  \\
\bottomrule
\end{tabular}
\caption{Complex types of anaphora in {\ARRAU} 3 and the previous release {\ARRAU} 2. GE=generic, BG=bridging, DD=discourse deixis, SP=split-antecedent plurals, AMB=ambiguous.}
\label{tab:arrau3-complex}
 \end{center}
%\normalsize
\end{table*}

\paragraph{Basic Statistics}

Table \ref{tab:arrau3-stats} compares the three releases of {\ARRAU} in terms of total number of documents, tokens, and markables. 
{\ARRAU}3 is only slightly larger than {\ARRAU} 2 in terms of %number of 
documents (\textbf{DC}) (558 vs 552) tokens (\textbf{TK}) (359,500 vs 348,072) and markables (\textbf{MK}) (106,700 vs 99,582). 
The number of non-referring expressions and discontinuous markables in {\ARRAU} 3 is also similar to that in {\ARRAU} 2, suggesting that this aspect of the annotation is by now fairly stable. 
%(Table to be included in final version, if accepted.)

%% Breakdown of non-referring stats as in Table 2 from 2020 article?

\paragraph{Complex forms of anaphoric reference}
Table \ref{tab:arrau3-complex} shows that the difference between {\ARRAU} 3 and {\ARRAU} 2 %the previous release 
is much more substantial when considering more complex cases of anaphoric reference. 
The figures for discourse deixis (\textbf{DD}) and split-antecedent plurals (\textbf{SP}) didn't change much - suggesting again that these annotations are %now 
fairly stable. 
However, the number of generic markables (\textbf{GE}), bridging references (\textbf{BG}) and markables identified as ambiguous (\textbf{AMB}) are much higher. 

%% Need to add here stats about bridging reference (Table 4 from 2020 paper)

%% Also maybe stats about non-referring and generic as in that paper?

%The full paper will contain tables with size statistics and analysis of the different types of complex anaphoric reference. 


\paragraph{Formats}

The corpus is available in the native {\MMAX} \ACRO{xml} format as well as in the Universal Anaphora format.

\paragraph{Availability}

Like the previous version, all of {\ARRAU} 3 will be available through \ACRO{ldc}, whereas the copyright-free subcorpora (\CODE{GNOME}, \CODE{PEAR}, and \CODE{TRAINS}-91) will also be available through the Universal Anaphora repository. 