R Calculate Correlation Only for Numeric Variables of Data Frame (Example Code)

In this R tutorial you’ll learn how to apply the cor function only to numeric variables.

Creation of Example Data

data(iris)                                       # Loading iris data set
head(iris)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
# 1          5.1         3.5          1.4         0.2  setosa
# 2          4.9         3.0          1.4         0.2  setosa
# 3          4.7         3.2          1.3         0.2  setosa
# 4          4.6         3.1          1.5         0.2  setosa
# 5          5.0         3.6          1.4         0.2  setosa
# 6          5.4         3.9          1.7         0.4  setosa

Example: Using unlist, lapply & is.numeric to Create Correlation Matrix of Numeric Variables

cor(iris[, unlist(lapply(iris, is.numeric))])    # Applying cor() function
#              Sepal.Length Sepal.Width Petal.Length Petal.Width
# Sepal.Length    1.0000000  -0.1175698    0.8717538   0.8179411
# Sepal.Width    -0.1175698   1.0000000   -0.4284401  -0.3661259
# Petal.Length    0.8717538  -0.4284401    1.0000000   0.9628654
# Petal.Width     0.8179411  -0.3661259    0.9628654   1.0000000

Related Articles

I have released numerous articles about related topics such as extracting data, importing data, and numeric values:

Leave a Reply

Your email address will not be published.

Fill out this field
Fill out this field
Please enter a valid email address.
You need to agree with the terms to proceed

Menu
Top