Hi,
Im trying to do: Bias-corrected data envelopment analysis with environmental variables.
I write:
library(rDEA)
library("readxl")
cee<-read_excel("C:///XXXX.xlsx")
cee<-as.data.frame(cee)
Y = cee[c('iinmo', 'icostesvar','isubven')]
X = cee[c('ovoluneg', 'osubapo', 'otrabdisc')]
Z = cee[c('LNTA','LNAGE','LQ','LPL','ROA','CEECAL','CEESAL','GROUP','CRISIS','GENDER')]
added only for testing of the manual
library(maxLik)
Bias-corrected DEA score in output-oriented model
with environmental variables, variable returns-to-scale
firms=1:609
di_env = dea.env.robust(
X=X[firms,], Y=Y[firms,], Z=Z[firms,], model="output",
RTS="variable",L1=100, L2=2000, alpha=0.05)
And then the following error message:
Error in array(x, c(length(x), 1L), if (!is.null(names(x))) list(names(x), :
'data' must be of a vector type, was 'NULL'
I have no idea what the error is or or where to start.
Could you please help me?
Thanks
CLP