I have a dataframe like this:
x1<-c(1,2,3,4,NA ,NA ,NA, 3, 1, 1, 1, 1, 2, 2, 3, 4, 4)
x2<-c(2,3,4,3,4,3,4,2,2,3,4,NA,NA,NA,NA,4,3)
x3<-c(1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,1,2)
m<-data.frame(x1,x2,x3)
I would like to create a frequency table like this:
x1 x2 x3
NA
1
2
3
4
where the values in each cell would be the count of the value for that
variable.
How can I do this?
The following will work IF all columns are integer:
apply(m, 2, function(x){tabulate(na.omit(x))})
x1 x2 x3
[1,] 5 0 5
[2,] 3 3 5
[3,] 3 5 4
[4,] 3 5 3
Please note that the result will look slightly different, if some columns contain
the largest value and others don't:
x1<-as.integer(c(1,2,3,4,NA ,NA ,NA, 3, 1, 1, 1, 1, 2, 2, 3, 4, 5))
m<-data.frame(x1,x2,x3)
apply(m, 2, function(x){tabulate(na.omit(x))})
$x1
[1] 5 3 3 2 1
$x2
[1] 0 3 5 5
$x3
[1] 5 5 4 3
cu
Philipp