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伙计们!我遇到了定义控件的问题。我有一个捐助国列表,但我不知道如何将其放入 R 中,以便它理解。我可以将它们列为“美国”、“俄罗斯”吗?我在这里有点迷路,不胜感激。

library(MSCMT)
data("project")
project <- listFromLong(project, unit.variable="country.index", time.variable="year", unit.names.variable="country.name")


treatment.identifier <- "Belarus"
controls.identifier <- ???
times.dep  <- cbind("rgdpna"                = c(1991,2009))
times.pred <- cbind("csh_g"          = c(1991,2009),
                    "csh_c"           = c(1991,2009),
                    "csh_i"            = c(1991,2009),
                    "csh_x"         = c(1991,2009),
                    "csh_m"                = c(1991,2009),
                    "rgdpna"                = c(1991,2009),
                    "csh_prod"       = c(1991,2009),
                    "csh_emp"            = c(1991,2009)
agg.fns <- rep("mean", ncol(times.pred))  
res <- mscmt(project, treatment.identifier, controls.identifier, times.dep, times.pred, agg.fns, seed=1)```   
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