Hi,
It is better to show the data using ?dput().  It is not clear whether your 
missing values are read as "" or NA in the dataset.
Also, assuming that the function is from library(ade4)

#1st case. NAs

dat <-  structure(list(X = structure(c(1L, 1L, NA, NA, 2L, 2L), .Label = 
c("df", 
"rd"), class = "factor"), Y = structure(c(1L, NA, 1L, 2L, NA, 
2L), .Label = c("as", "eq"), class = "factor")), .Names = c("X", 
"Y"), class = "data.frame", row.names = c(NA, -6L))  

#2nd case ""

dat1 <- structure(list(X = structure(c(2L, 2L, 1L, 1L, 3L, 3L), .Label = c("", 
"df", "rd"), class = "factor"), Y = structure(c(2L, 1L, 2L, 3L, 
1L, 3L), .Label = c("", "as", "eq"), class = "factor")), .Names = c("X", 
"Y"), class = "data.frame", row.names = c(NA, -6L))



library(ade4)


 acm.disjonctif(dat)
#  X.df X.rd Y.as Y.eq
#1    1    0    1    0
#2    1    0    0    0
#3    0    0    1    0
#4    0    0    0    1
#5    0    1    0    0
#6    0    1    0    1
 acm.disjonctif(dat1)
#  X. X.df X.rd Y. Y.as Y.eq
#1  0    1    0  0    1    0
#2  0    1    0  1    0    0
#3  1    0    0  0    1    0
#4  1    0    0  0    0    1
#5  0    0    1  1    0    0
#6  0    0    1  0    0    1

#It seems that your data is similar to dat1
dat1[dat1==''] <- NA
 dat1 <- droplevels(dat1)
 acm.disjonctif(dat1)
#  X.df X.rd Y.as Y.eq
#1    1    0    1    0
#2    1    0    0    0
#3    0    0    1    0
#4    0    0    0    1
#5    0    1    0    0
#6    0    1    0    1

A.K.



I have missing values in my data:

            X               Y
           df            as
           df              
                            as
                            eq
           rd
           rd            eq


I am using the function ' acm.disjonctif' in R. But this function considers the 
missing values as factor (it assigned 1's):

  X. X.df X.rd Y. Y.as Y.eq
1  0    1    0  0    1    0
2  0    1    0  1    0    0
3  1    0    0  0    1    0
4  1    0    0  0    0    1
5  0    0    1  1    0    0
6  0    0    1  0    0    1


I want to use acm.disjonctif but I do not want to use the missing values (so 
columns X. and Y.) in this table. How can I solve this problem? 


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