[R-meta] Inverting negative correlations

[Michael Dewey]

Note that this question has already been asked and answered on 
CrossValidated

https://stats.stackexchange.com/questions/503654/inverting-a-negative-correlation

Michael

On 06/01/2021 19:06, Dr. Gerta Rücker wrote:
> Dear David,
> 
> Yes, this is correct because
> 
> Cov(X,-Y) = - Cov(X,Y)
> 
> and the same holds for the correlations.
> 
> It is important that the wording is correct. For your example, the 
> interpretation would be that if there is a negative correlation between 
> social anxiety and extraversion, there is a positive correlation between 
> social anxiety and intraversion.
> 
> Best,
> 
> Gerta
> 
> Am 06.01.2021 um 19:50 schrieb david detullio:
>> Hello all, I want to include correlation coefficients in a random-effects
>> model for meta-analysis. If the majority of the correlations are 
>> positive,
>> could I use the absolute values of any negative correlations if such
>> correlations would have been positive had one of the measures been 
>> reverse
>> scored? As an example, say there is a negative correlation between a
>> measure for social anxiety and a measure for extraversion. Would it be
>> possible to take the absolute value of the correlation under the 
>> assumption
>> that the correlation would be positive if the measure for extraversion 
>> was
>> reverse scored? Any answers would be appreciated, and if anyone knows of
>> source material that talks about this process, the reference would be
>> appreciated as well.
>>
>>     [[alternative HTML version deleted]]
>>
>> _______________________________________________
>> R-sig-meta-analysis mailing list
>> R-sig-meta-analysis using r-project.org
>> https://stat.ethz.ch/mailman/listinfo/r-sig-meta-analysis
> 
> _______________________________________________
> R-sig-meta-analysis mailing list
> R-sig-meta-analysis using r-project.org
> https://stat.ethz.ch/mailman/listinfo/r-sig-meta-analysis
> 

-- 
Michael
http://www.dewey.myzen.co.uk/home.html