答案 0 :(得分:2)
我想你需要
Large.Cap$V1[e_crs$eff > 0.85]
使用?dea
library(Benchmarking)
x <- matrix(c(100,200,300,500,100,200,600),ncol=1)
y <- matrix(c(75,100,300,400,25,50,400),ncol=1)
Large.Cap <- data.frame(v1= LETTERS[1:7], v2= 1:7)
e_crs <- dea(x, y, RTS='crs', ORIENTATION='in')
e_crs
#[1] 0.7500 0.5000 1.0000 0.8000 0.2500 0.2500 0.6667
e_crs
对象是list
str(e_crs)
#List of 12
# $ eff : num [1:7] 0.75 0.5 1 0.8 0.25 ...
# $ lambda : num [1:7, 1:7] 0 0 0 0 0 0 0 0 0 0 ...
# ..- attr(*, "dimnames")=List of 2
# .. ..$ : NULL
# .. ..$ : chr [1:7] "L1" "L2" "L3" "L4" ...
# $ objval : num [1:7] 0.75 0.5 1 0.8 0.25 ...
# $ RTS : chr "crs"
# $ primal : NULL
# $ dual : NULL
# $ ux : NULL
# $ vy : NULL
# $ gamma :function (x)
# $ ORIENTATION: chr "in"
# $ TRANSPOSE : logi FALSE
# $ param : NULL
# - attr(*, "class")= chr "Farrell"
我们提取&#39; eff&#39;来自&#39; e_crs&#39;的list
元素到subset
&#39; v1&#39;专栏&#39; Large.Cap&#39;数据集。
droplevels(Large.Cap$v1[e_crs$eff > 0.85])
#[1] C
#Levels: C