Counting the frequency of unique values - R

547 Asked by Amitraj in Data Science , Asked on Jul 27, 2021

I am working with the 'mtcars' data-set:

mpg cyl disp hp drat wt qsec vs am gear carb

Mazda RX4 21.0 6 160 110 3.90 2.620 16.46 0 1 4 4

Mazda RX4 Wag 21.0 6 160 110 3.90 2.875 17.02 0 1 4 4

Datsun 710 22.8 4 108 93 3.85 2.320 18.61 1 1 4 1

Hornet 4 Drive 21.4 6 258 110 3.08 3.215 19.44 1 0 3 1

Hornet Sportabout 18.7 8 360 175 3.15 3.440 17.02 0 0 3 2

Valiant 18.1 6 225 105 2.76 3.460 20.22 1 0 3 1

I want to find out the number of frequency of unique values for the 'cyl' column, i.e, number of occurences of each value. How to count count frequency in r?

Answered by Dylan Forsyth

You can use plyr module. It will give you the frequency count. You can see the below example.

> library("plyr")

> count(mtcars, 'gear')

  gear freq

1    3   15

2    4   12

3    5    5

You can use table() function will help you out in this case:

table(mtcars$cyl)

 4  6  8 

11  7 14

Counting the frequency of unique values - R

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