[R] Correlation Matrix - p value?

[Dennis Murphy]

Works for me:

> x <- rnorm(10)
> y <- rnorm(10)
> cor.test(x, y, method = 'spearman')$p.value
[1] 0.166058


What are the classes of your inputs? A reproducible example would be
helpful. From the help page of cor.test():

x, y	 numeric vectors of data values. x and y must have the same length.

Do your two inputs meet those criteria?

HTH,
Dennis

On Tue, Aug 9, 2011 at 5:58 AM, ScottM <scott.mcgrane at abdn.ac.uk> wrote:
> Cheers Jorge,
>
> I've tried this, but keep getting error messages, relating to either:
>
> Error: unexpected '$' in "$"
>
> or
>
> Error in cor(data, method = "spearman")$p.value :
>  $ operator is invalid for atomic vectors
>
> Very annoying!
>
> S
>
> Scott McGrane MA (Hons), MRes
> SAGES Theme 1 PhD Student
> Northern Rivers Institute
> St Mary's Building
> University of Aberdeen
>
> http://www.abdn.ac.uk/nri
> ________________________________________
> From: Jorge Ivan Velez [via R] [ml-node+3729864-606556654-252737 at n4.nabble.com]
> Sent: 09 August 2011 01:55 PM
> To: Mcgrane, Scott
> Subject: Re: Correlation Matrix - p value?
>
> ?cor.test
> cor.test(x, y, method = "spearman")$p.value
>
> HTH,
> Jorge
>
>
> On Tue, Aug 9, 2011 at 8:44 AM, ScottM <> wrote:
>
>> Hello all,
>>
>> I've run a Spearman's Rank test to discern relationships between landscape
>> characteristics and a specific aspect of river behaviour.
>>
>> I've executed a correlation matrix between the one dependent variable and
>> all of the predictors, which gives me a nice output of Spearman's Rho
>> values.
>>
>> However, I also need to somehow find the "p" value, to assess the strength
>> of relationship.
>>
>> Conducting a simple correlation between 2 variables using the:
>>
>> cor(var1, var2, method="spearman")
>>
>> command gives me an output with both the Rho and P value, but the default
>> output of the matrix is simply the Rho value.  I've tried using
>> summary(result), but it just produces the percentile/max/min values.
>>
>> Any help appreciated.
>>
>> Cheers,
>>
>> S.
>>
>> --
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