% \VignetteIndexEntry{Supervised Classification}

<<echo=false,results=hide>>=
options(width=50)
@

\documentclass[a4paper]{article}

\usepackage[ansinew]{inputenc}

\begin{document}

\title{Example Session for Supervised Classification}
\author{Andreas Borg, Murat Sariyar}
\maketitle

This document shows an example session for using supervised classification
in the package \textit{RecordLinkage} for deduplication of a single data set.
Conducting linkage of two data sets differs only in the step of generating
record pairs.

See also the vignette on Fellegi-Sunter deduplication for some general
information on using the package.

\section{Generating comparison patterns}

<<results=hide,echo=false>>=
library(RecordLinkage)
library(xtable)
@

In this session, a training set with 50 matches and 250
non-matches is generated from the included data set \texttt{RLData10000}. 
Record pairs from the set \texttt{RLData500} are used to calibrate and 
subsequently evaluate the classifiers.
<<>>=
data(RLdata500)
data(RLdata10000)
train_pairs=compare.dedup(RLdata10000, identity=identity.RLdata10000,
  n_match=500, n_non_match=500)

eval_pairs=compare.dedup(RLdata500,identity=identity.RLdata500)
@


\section{Training}

\texttt{trainSupv} handles calibration of supervised classificators which are 
selected through the argument \texttt{method}. In the
following, a single decision tree (rpart), a bootstrap aggregation of decision trees
(bagging) and a support vector machine are calibrated (svm).

<<>>=
model_rpart=trainSupv(train_pairs, method="rpart")
model_bagging=trainSupv(train_pairs, method="bagging")
model_svm=trainSupv(train_pairs, method="svm")
@

\section{Classification}

\texttt{classifySupv} handles classification for all supervised classificators,
taking as arguments the structure returned by \texttt{trainSupv} which contains
the classification model and the set of record pairs which to classify.

<<>>=
result_rpart=classifySupv(model_rpart, eval_pairs)
result_bagging=classifySupv(model_bagging, eval_pairs)
result_svm=classifySupv(model_svm, eval_pairs)
@

\section{Results}

\subsection{Rpart}
<<results=tex,echo=false>>=
texSummary(result_rpart)
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\subsection{Bagging}
<<results=tex,echo=false>>=
texSummary(result_bagging)
@

\subsection{SVM}
<<results=tex,echo=false>>=
texSummary(result_svm)
@
\end{document}