What is the difference between various methods used for correlation in R

r
correlation

#1

In the above image,the correlation coefficient from the three different methods are quite different.I want to know why there is such a difference and if the method that is to be used depends on any particular condition as such.


#2

Yes all three are different ways to calculate correlations. Infact kendall and spearman rank correlation are non parametric in nature. You can learn more by reading this article :