This file is indexed.

/usr/lib/R/site-library/Matching/INDEX is in r-cran-matching 4.9-2-1.

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The actual contents of the file can be viewed below.

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GenMatch                Genetic Matching
GerberGreenImai         Gerber and Green Dataset used by Imai
Match                   Multivariate and Propensity Score Matching
                        Estimator for Causal Inference
MatchBalance            Tests for Univariate and Multivariate Balance
Matchby                 Grouped Multivariate and Propensity Score
                        Matching
balanceUV               Univariate Balance Tests
ks.boot                 Bootstrap Kolmogorov-Smirnov
lalonde                 Lalonde Dataset
qqstats                 QQ Summary Statistics
summary.Match           Summarizing output from Match
summary.Matchby         Summarizing output from Matchby
summary.balanceUV       Summarizing output from balanceUV
summary.ks.boot         Summarizing output from ks.boot