One of our graduate student ask me on how he can check for correlated variables on his dataset. Using R, his problem can be done is three (3) ways. First, he can use the
cor function of the
stat package to calculate correlation coefficient between variables. Second, he can use functions such as
pairs (graphics) to visually check possible correlated variables. Third, he can combine the first two approach following the example of
vinux in
stackoverflow or using
ggpairs function of
GGally package.
First Approach
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
Second Approach
Third Approach
