如何获取摘要中的Pair Distance列（MatchIt）

Question

我正在尝试比较不同的 CEM 匹配，不幸的是 MatchIt 包没有 L 统计量，因此我想比较可以通过汇总函数获得的配对距离列

如何只打印该列？（由于我在原始数据集上进行了多次试验，并且变量很多，所以我想避免复制和粘贴）

library(tidyverse)
library(MatchIt)

data(lalonde)

cem1 <- matchit(treat ~ age + re74 + re75, data = lalonde, 
                 method = "cem")

cem2 <- matchit(treat ~ age + re74 + re75, data = lalonde, 
               method = "cem",
               cutpoints= list(age = c(20.5, 25.5, 30.5,35.5,40.5))
               )

summary(cem1, un=TRUE)
summary(cem2, un=TRUE)

我得到的结果

Call:
matchit(formula = treat ~ age + re74 + re75, data = lalonde, 
    method = "cem", cutpoints = list(age = c(20.5, 25.5, 30.5, 
        35.5, 40.5)))

Summary of Balance for All Data:
     Means Treated Means Control Std. Mean Diff. Var. Ratio eCDF Mean eCDF Max
age        25.8162       28.0303         -0.3094     0.4400    0.0813   0.1577
re74     2095.5737     5619.2365         -0.7211     0.5181    0.2248   0.4470
re75     1532.0553     2466.4844         -0.2903     0.9563    0.1342   0.2876


Summary of Balance for Matched Data:
    Means Treated Means Control Std. Mean Diff. Var. Ratio eCDF Mean eCDF Max Std. Pair 
                                                                                   Dist.
age        25.6286       25.8312         -0.0283     0.6863    0.0222   0.0619     0.2364     
re74     1299.0813     1755.5500         -0.0934     1.1026    0.0672   0.3764     0.1321     
re75     1016.9323     1228.5970         -0.0657     1.0062    0.0471   0.1852     0.1617    

Percent Balance Improvement:
     Std. Mean Diff. Var. Ratio eCDF Mean eCDF Max
age             90.8       54.1      72.7     60.8
re74            87.0       85.1      70.1     15.8
re75            77.3       86.2      64.9     35.6

Sample Sizes:
              Control Treated
All            429.       185
Matched (ESS)  169.79     175
Matched        288.       175
Unmatched      141.        10
Discarded        0.         0

我希望得到一个或多或少这样的table

       cem1          cem2
       Pair. Dist.   Pair. Dist. 
age    0.1616        0.2364
re74   0.1289        0.1321 
re75   0.1671        0.1617

Answer 1

summary() 输出只是一个列表。您可以使用 str().

查看其详细信息

要仅获取感兴趣的列，请使用以下命令：

cbind(
  summary(cem1)$sum.matched[,"Std. Pair Dist."],
  summary(cem2)$sum.matched[,"Std. Pair Dist."]
)

如何获取摘要中的Pair Distance列（MatchIt）

How to obtain Pair Distance column in summary (MatchIt)

r

summary

matching