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\newcommand{\MatchIt}{\textsc{MatchIt}}

\title{\MatchIt: Nonparametric Preprocessing for Parametric Causal
  Inference\thanks{We thank Olivia Lau for helpful suggestions about
    incorporating \MatchIt\, into Zelig.}}

\author{Daniel E. Ho,\thanks{Assistant Professor of Law 
\& Robert E.\ Paradise Faculty Scholar, Stanford Law
    School (559 Nathan Abbott Way, Stanford CA 94305;
    \texttt{http://dho.stanford.edu}, \texttt{dho@law.stanford.edu},
    (650) 723-9560).}  \and %
  Kosuke Imai,\thanks{Assistant Professor, Department of Politics,
    Princeton University (Corwin Hall 041, Department of Politics,
    Princeton University, Princeton NJ 08544, USA;
    \texttt{http://imai.princeton.edu},
    \texttt{kimai@Princeton.Edu}).}  \and %
  Gary King,\thanks{David Florence Professor of Government, Harvard
    University (Institute for Quantitative Social Science, 1737
    Cambridge Street, Harvard University, Cambridge MA 02138;
    \texttt{http://GKing.Harvard.Edu}, \texttt{King@Harvard.Edu},
    (617) 495-2027).}  \and %
Elizabeth A. Stuart\thanks{Assistant Professor, Departments of Mental 
Health and Biostatistics, Johns Hopkins Bloomberg School of Public Health 
(624 N Broadway, Room 804, Baltimore, MD 21205; 
  \texttt{http://www.biostat.jhsph.edu/$\sim$estuart},
  \texttt{estuart@jhsph.edu}).}}

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\begin{rawhtml}
  <p> [Also available is a downloadable <a
  href="/matchit/docs/matchit.pdf">PDF</a> version of this entire
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\chapter{Introduction}
\input{intro}


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\chapter{Statistical Overview}
\input{overview}

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\chapter{User's Guide to \MatchIt}
\label{methods}

\input{preprocess}
\input{balance}
\input{matchit2zelig}

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\chapter{Reference Manual}
\label{chap:reference}

\section{\texttt{matchit()}: Implementation of Matching Methods}
\label{sec:matchit}
Use \texttt{matchit()} to implement a variety of matching procedures
including exact matching, nearest neighbor matching,
subclassification, optimal matching, genetic matching, and full
matching.  The output of {\tt matchit()} can be analyzed via any
standard R package, by exporting the data for use in another program,
or most simply via \hlink{Zelig}{http://gking.harvard.edu/zelig} in R.

\input{matchitref}
\input{summaryref}
\input{plotref}
\input{mdataref}
\input{faq}

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\chapter{What's New?}

\begin{itemize}
\item \textbf{2.4-11} (June 25, 2009): More flexible inputs in
  plotting.
\item \textbf{2.4-10} (February 2, 2009): Minor documentation fixes
\item \textbf{2.4-8,2.4-9} (January 29, 2009): Minor documentation fixes
\item \textbf{2.4-7} (August 4, 2008): Fixed minor bug in subclassification 
(thanks to Ben Domingue)
\item \textbf{2.4-6} (July 21, 2008): Improved summary object for
  exact matching (thanks to Andrew Stokes)
\item \textbf{2.4-5} (July 20, 2008): Fixed a minor bug.
\item \textbf{2.4-4} (July 18, 2008): Fixed another bug with regard to the discard option (thanks to Ben Dominique).
\item \textbf{2.4-3} (July 18, 2008): Fixed a bug in full matching
  regarding the discard option (thanks to Ben Dominique). Some updates
  of documentation regarding coarsened exact matching (2.4-1 and
  2.4-2).
\item \textbf{2.4} (June 12, 2008): Included coarsened exact matching;
  documentation bug fixes (thanks to Will Lowe)
\item \textbf{2.3-1} (October 11, 2007): Stable release for R
  2.6. Documentation improved. Some minor bug fixes and improvements.
\item \textbf{2.2-14} (September 2, 2007): Stable release for R 2.5.
  Documentation improved for full matching. (Thanks to Langche Zeng)
\item \textbf{2.2-13} (April 10, 2007): Stable release for R
  2.4. Additional fix to package dependencies. Bug fix for summary().
\item \textbf{2.2-12} (April 6, 2007): Stable release for R 2.4. Fix
  to package dependencies.
\item \textbf{2.2-11} (July 13, 2006): Stable release for R 2.3.
  Fix to ensure summary() command works with character variables in dataframe (thanks to Daniel Gerlanc).
\item \textbf{2.2-10} (May 9, 2006): Stable release for R 2.3.
  A bug fix in {\tt demo(analysis)} (thanks to Julia Gray).
\item \textbf{2.2-9} (May 3, 2006): Stable release for R 2.3.
  A minor change to DESCRIPTION file.
\item \textbf{2.2-8} (May 1, 2006): Stable release for R 2.3.
  Removed dependency on Zelig (thanks to Dave Kane).
\item \textbf{2.2-7} (April 11, 2006): Stable release for R 2.2.
  Error message for missing values in the data frame added
  (thanks to Olivia Lau).
\item \textbf{2.2-6} (April 4, 2006): Stable release for R 2.2.
  Bug fixes related to {\tt reestimate} in {\tt matchit()} and {\tt
  match.data()} (thanks to Ani Ruhil and Claire Aussems). 
\item \textbf{2.2-5} (December 7, 2005): Stable release for R 2.2.
  Changed URL of {\tt WhatIf} to CRAN.
\item \textbf{2.2-4} (December 3, 2005): Stable release for R 2.2.
  User's own distance measure can be used with \MatchIt\, (thanks to
  Nelson Lim).
\item \textbf{2.2-3} (November 18, 2005): Stable release for R 2.2.
  standardize option added to full matching and subclass (thanks to
  Jeronimo Cortina).
\item \textbf{2.2-2} (November 9, 2005): Stable release for R 2.2.
  {\tt optmatch} package now on CRAN. Changed URL for that package. 
\item \textbf{2.2-1} (November 1, 2005): Stable release for R 2.2.
  balance measures based on empirical CDF are added as a new option
  {\tt standardize} in {\tt summary()}.
\item \textbf{2.1-4} (October 14, 2005): Stable release for R 2.2.
  strictly empirical (no interpolation) quantile-quantile functions
  and plots are used.
\item \textbf{2.1-3} (September 27, 2005): Stable release for R 2.1.
  automated the installation of optional packages. fixed a coding
  error in {\tt summary()}, the documentation edited.
\item \textbf{2.1-2} (September 27, 2005): Stable release for R 2.1.
  minor changes to file names, the option {\tt "whichxs"} added to the
  {\tt plot()}, major editing of the documentation.
\item \textbf{2.1-1} (September 16, 2005): Stable release for R
        2.1. Genetic matching added.    
\item \textbf{2.0-1} (August 29, 2005): Stable release for R 2.1.
  Major revisions including some syntax changes. Statistical tests are
  no longer used for balance checking, which are now based on the
  empirical covariate distributions (e.g., quantile-quantile plot).
\item \textbf{1.0-2} (August 10, 2005): Stable release for R
  2.1. Minor bug fixes (Thanks to Bart Bonikowski).
\item \textbf{1.0-1} (January 3, 2005): Stable release for R 2.0. The
  first official version of \MatchIt
\end{itemize}



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