R中的马氏距离与最近邻匹配 [英] Nearest-neighbor matching with the Mahalanobis distance in R

问题描述

我想使用R中的MatchIt包，使用带有卡尺的马氏距离来执行最近的邻居匹配.我应该使用 matchit 函数的以下两个参数中与马哈拉诺比斯距离相关的哪个参数:

I would like to use the MatchIt package in R to perform nearest neighbor matching using the Mahalanobis distance withing some caliper. Which of the following two parameters of the matchit function that are related to the Mahalanobis distance should I use:

1. distance ="mahalanobis" 参数，或
2. mahvars 参数(例如， mahvars = c("X1"，"X2"))?

1. the distance="mahalanobis" param, or
2. the mahvars param (e.g., mahvars = c("X1", "X2")?

两者之间有什么区别?

有关此文档的文档很简短(请参见第16和19页): https://imai.fas.harvard.edu/research/files/matchit.pdf .

The documentation is terse about this (see pages 16 and 19): https://imai.fas.harvard.edu/research/files/matchit.pdf.

推荐答案

来自 https://cran.r-project.org/web/packages/MatchIt/vignettes/matching-methods.html :

设置 distance ="mahalanobis" 和 method ="nearest" 可使 MatchIt 与Mahalanobis进行近邻匹配距离，而不考虑倾向得分.并使用主公式中提供的协变量.

Setting the distance="mahalanobis" and method="nearest" make MatchIt to run Nearest-neighbour matching with the Mahalanobis distance, without the consideration of the propensity score. And the covariates supplied in the main formula are used.

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