### --------------------------------------------------------------
### Spearman rank correlation, frigatebird example



Data = read.table(textConnection(Input),header=TRUE)


cor.test( ~ Pitch + Volume, 
         data=Data,
         method = "spearman",
         continuity = FALSE,
         conf.level = 0.95)



Spearman's rank correlation rho



S = 1708.382, p-value = 0.0002302

sample estimates:

       rho

-0.7630357

plot(Pitch ~ Volume, 
     data=Data, 
     pch=16)

 

Spearman's rank correlation rho

 

S = 1111.908, p-value = 0.1526

 

       rho

-0.3626323