correlation {agricolae} | R Documentation |
It obtains the coefficients of correlation and p-value between all the variables of a data table. The methods to apply are Pearson, Spearman , Kendall and lin's concordance index. In case of not specifying the method, the Pearson method will be used. The results are similar to SAS.
correlation(x,y=NULL, method = c("pearson", "kendall", "spearman", "lin") ,alternative="two.sided")
x |
table, matrix or vector |
y |
table, matrix or vector |
method |
"pearson", "kendall", "spearman", "lin" |
alternative |
"two.sided", "less", "greater" |
Parameters equal to function cor()
The correlation matrix with its probability
Felipe de Mendiburu
Lin LI. A concordance correlation coefficient to evaluate reproducibility. Biometrics. 1989; 45, 255-268.
library(agricolae) data(soil) # example 1 analysis<-correlation(soil[,2:8],method="pearson") analysis # Example 2: correlation between pH, variable 2 and other elements from soil. analysis<-with(soil,correlation(pH,soil[,3:8],method="pearson",alternative="less")) analysis # Example 3: correlation between pH and clay method kendall. with(soil,correlation(pH,clay,method="kendall", alternative="two.sided"))