Transition to Corrplot matrix

Question

I need to build a correlation matrix, and I'm trying to adjust some parameters to adapt the graph. I am using the corrplot package.

I built the corrplot matrix as follows:

 corrplot(cor(d1[,2:14], d1[,2:14]), method=c("color"), bg = "white", addgrid.col = "gray50", tl.cex=1, type="lower", tl.col = "black", col = colorRampPalette(c("red","white","blue"))(100)) 

I need to show the correlation values ​​in the bottom matrix inside the color matrix that I built. How can i do this?

The diagonal of the correlation matrix is ​​always 1, and so I would like to know whether it is possible to exclude the main diagonal from the lower matrix?

I would also like to show significant correlation values ​​using stars instead of squares. For example, ( * , ** , *** ). Is it possible?

Answer 1

Check out the “Combine with significance test” section: http://cran.r-project.org/web/packages/corrplot/vignettes/corrplot-intro.html