Gary King

Albert J. Weatherhead III University Professor at Harvard University

1737 Cambridge St. Cambridge, MA 02138 (email)

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MatchIt: Nonparametric Preprocessing for Parametric Causal Inference

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MATCHIT: Nonparametric Preprocessing for Parametric Causal Inference1

Daniel E. Ho,2

Kosuke Imai,3

Gary King,4

Elizabeth A. Stuart5


[Also available is a downloadable PDF version of this entire document]



  • Contents
  • Introduction
    • What MATCHIT Does
    • Software Requirements
    • Installing MATCHIT
    • Loading MATCHIT
    • Updating MATCHIT

  • Statistical Overview
    • Preprocessing via Matching
    • Checking Balance
    • Conducting Analyses after Matching

  • User's Guide to MATCHIT
    • Preprocessing via Matching
      • Quick Overview
      • Examples
    • Checking Balance
      • Quick Overview
      • Details
    • Conducting Analyses after Matching
      • Quick Overview
      • Examples

  • Reference Manual
    • matchit(): Implementation of Matching Methods
    • summary(): Numerical Summaries of Balance
    • plot(): Graphical Summaries of Balance
      • Plot options for the matchit object
      • Plot options for the matchit summary object
    • match.data(): Extracting the Matched Data Set
      • Usage
      • Arguments
      • Examples

  • Frequently Asked Questions
    • How do I Cite this Work?
    • What if My datasets Are Big and Are Taking Up Too Much Memory?
    • How Exactly are the Weights Created?
    • How Do I Create Observation Names?
    • How Can I See Outcomes of Matched Pairs?
    • How Do I Ensure Replicability As MATCHIT Versions Develop?
    • How Do I Use My Own Distance Measure with MATCHIT?
    • What Do I Do about Missing Data?
    • Why Preprocessing?

  • What's New?
  • Bibliography


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