Calculate ATE - Matchit

2 May 2017

Dear all,
May I ask a question about package: MatchIt (version 2.4-22) in R(3.3.2)?
When I want to calculate ate by the code below, it doesn't work. Could you
help me solve the problem? Because when I run
...
  s.out1$qi$att.ev,  it comes the error: Error in
s.out1$qi$att.ev : object of type 'closure' is not subsettable
I think it can not find qi object in s.out1 because it's a function? So I
can't call the object att.ev from qi? Do you have any suggestion for
calculating ate?

The code is below:
m.out1 <- matchit(treat ~ age + educ + black + hispan + nodegree +
married + re74 + re75, method = "nearest", data = lalonde)
z.out1 <- zelig(re78 ~ age + educ + black + hispan + nodegree +
married + re74 + re75, data = match.data(m.out1, "control"),
model = "ls")
x.out1 <- setx(z.out1, data = match.data(m.out1, "treat"), cond = TRUE)
s.out1 <- sim(z.out1, x = x.out1)

z.out2 <- zelig(re78 ~ age + educ + black + hispan + nodegree +
married + re74 + re75, data = match.data(m.out1, "treat"),
model = "ls")
x.out2 <- setx(z.out2, data = match.data(m.out1, "control"), cond = TRUE)
s.out2 <- sim(z.out2, x = x.out2)
ate.all <- c(s.out1$qi$att.ev, -s.out2$qi$att.ev)

Thank you so much

Best,
Wan-Yi,Chou

*Wan-Yi Chou (May Chou), Master*
*Management Science, **National Chiao Tung University*

*國立交通大學管理科學研究所 *
*周宛誼*｜*Email mayritaspring(a)gmail.com &lt;mayritaspring(a)gmail.com&gt; *
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*Wan-Yi Chou (May Chou), Master*
*Management Science, **National Chiao Tung University*

*國立交通大學管理科學研究所 *
*周宛誼*｜*Email mayritaspring(a)gmail.com &lt;mayritaspring(a)gmail.com&gt; *