### --------------------------------------------------------------### 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