[R] pearson correlation significant level

Jose Iparraguirre Jose.Iparraguirre at ageuk.org.uk
Fri May 17 17:37:45 CEST 2013

Dear Elaine,

One of the elements you obtain the P matrix, which is the matrix of  asymptotic p-values. In your case, you get that the asymptotic p-value of the association between t_i and t_r is 0. That is, there would exist a perfect association (look also at the first result, the matrix of correlations: the correlation coefficient between these variables is 1).
Hope this helps,

Prof. José Iparraguirre
Chief Economist
Age UK

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Elaine Kuo
Sent: 17 May 2013 10:40
To: r-help at r-project.org
Subject: [R] pearson correlation significant level


I am using package Hmisc to calculate the pearson correlation and the significant level for the matrix of t_i and t_r. (temperature minimum and temperature range)

However, I have difficulty interpreting the result, even after checking the manual.
Please kindly help to indicate if the p-value is zero.
Thank you in advance.

The code
> library(Hmisc)
> rcorr(as.matrix(datat), type="pearson") # type can be pearson or 
> spearman

The result is
     t_i   t_r
t_i  1.00 -0.89
t_r -0.89  1.00

n= 4873

    t_i t_r
t_i      0
t_r  0

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