[R] ANOVA/statistics question

[drmh]

Hi, thanks for your prompt reply

In my situation, the dependent variable is "post-test" and the independent
variables are "pre" and "coh".
Howw would I find the correlation between coh and post with the effect of
"pre" regressed using your commands?



Tal Galili wrote:
> 
> Hi Douglas
> I would go for a different command then aov.
> something like:
> ?cor
> or
> ?cor.test
> To also get the p value of the correlation.
> 
> Cheers,
> Tal
> 
> 
> 
> On Sat, Apr 25, 2009 at 8:27 AM, drmh
> <douglasrmholmes at googlemail.com>wrote:
> 
>>
>> (Have searched for this already)
>>
>> Hi,
>>
>> How do you find the strength of correlation between two variables using
>> an
>> ANOVA table?  "Pr(>F)" gives the statistical significance of the
>> association, but not the strength of the correlation.
>>
>> See data (from R) below
>>
>> Readable:
>>                      "Df"     "Sum Sq"        "Mean Sq"           "F
>> value"
>> "Pr(>F)"
>> "pre"              1           0.00593          0.00593936
>> 0.7450563       0.401636958677004
>> "coh"             1           0.04311          0.04311302
>>  5.4082639
>> 0.0344751749542619
>> "Residuals"    15         0.11957          0.00797169          NA
>> NA
>>
>> Original:
>> "Df" "Sum Sq" "Mean Sq" "F value" "Pr(>F)"
>> "pre" 1 0.0059393604629317 0.0059393604629317 0.745056336657567
>> 0.401636958677004
>> "coh" 1 0.0431130207164516 0.0431130207164516 5.40826398359156
>> 0.0344751749542619
>> "Residuals" 15 0.119575396598395 0.00797169310655964 NA NA
>>
>> Any help would be greatly appreciated,
>> Douglas Holmes
>> --
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>> ______________________________________________
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>> PLEASE do read the posting guide
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>> and provide commented, minimal, self-contained, reproducible code.
>>
> 
> 
> 
> -- 
> ----------------------------------------------
> 
> 
> My contact information:
> Tal Galili
> Phone number: 972-50-3373767
> FaceBook: Tal Galili
> My Blogs:
> http://www.r-statistics.com/
> http://www.talgalili.com
> http://www.biostatistics.co.il
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

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