CODEWITHSUNDEEP
r
maximusdooku
maximusdooku

Reputation: 5522

How can I find out what proportion of values fall outside range?

v <- c(1,2,3,4,5,6)

And I mention max=4,min=2

So, I want to know how many values fall outside this range.

I can do this (v < 2 & v > 4)

But not sure how to do the count...

After that I will simply create a percentage with respect to total number of values (here 6).

Upvotes: 3

Views: 3311

Answers (2)

Alex A.
Alex A.

Reputation: 5586

You can create and sum a logical vector. TRUE elements count as 1 and FALSE as 0, so this will give you the number of elements matching a particular condition.

v <- c(1, 2, 3, 4, 5, 6)

sum(v < 2 | v > 4)

The latter returns 3 because there are three values less than 2 or greater than 4. The comparisons are vectorized, so v < 2 tests whether each element of v in turn is less than 2. The OR operator is given by | in R.

To get the proportion of values beyond the range, you can divide the sum by the length of the vector, or alternatively use mean(), since the mean is the sum divided by the length.

mean(v < 2 | v > 4)

Upvotes: 3

Jota
Jota

Reputation: 17611

You can simply do:

sum(v < 2 | v > 4) / length(v)
[1] 0.5

You want to use | instead of & because no number will be both less than 2 and greater than 4.

Upvotes: 2

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