Question

I have a dataset like this:

x
       A      B
1      x      2
2      y      4
3      z      4
4      x      4
5      x      4
6      x      3
......

I want to know if in this dataset are present a same number of “A” upper than some value(for example 3).

Probably i will need to group this value in a temporary table getting this:

  X    Y     z
  4    1     1

and after this i will call another method (that i don’t know) that gives me this result

X

because only the value X is present more than 3 times in my previous table.
Can R optimise this operation?

Answer 1

data<-data.frame(factor(c(“x”,”y”,”z”,”x”,”x”,”x”)),c(2,4,4,4,4,3))

To get the count of each letter, do

table(data[,1])

and to get the name of the factors with > 3

names(table(data[,1]))[table(data[,1]) > 3]