You could calculate the confidence interval of the correlation at your desired df: http://davidmlane.com/hyperstat/B8544.html
The below code takes as arguments the observed correlation, N, and alpha, calculates the confidence interval and checks whether this includes 0. cor.test2=function(r,n,a=.05){ phi=function(x){ log((1+x)/(1-x))/2 } inv.phi=function(x){ (exp(2*x)-1)/(exp(2*x)+1) } r.prime=phi(r) err=qnorm(1-(a/2))/sqrt(n-3) lims=c(inv.phi(r.prime-err),inv.phi(r.prime+err)) sig=ifelse(xor(all(0<lims),all(0>lims)),T,F) return(sig) } > On 14-Jun-07, at 5:40 AM, Florence Dufour wrote: > >> >> Hello, >> >> I want to compute a correlation test but I do not want to use the >> degrees of freedom that are calculated by default but I want to set a >> particular number of degrees of freedom. >> I looked in the manual, different other functions but I did not found >> how to do it >> >> Thanks in advance for your answers >> >> Yours >> >> >> >> >> Florence Dufour >> PhD Student >> AZTI Tecnalia - Spain >> >> ______________________________________________ >> R-help@stat.math.ethz.ch 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. > > -- > Mike Lawrence > Graduate Student, Department of Psychology, Dalhousie University > > Website: http://myweb.dal.ca/mc973993 > Public calendar: http://icalx.com/public/informavore/Public > > "The road to wisdom? Well, it's plain and simple to express: > Err and err and err again, but less and less and less." > - Piet Hein > -- Mike Lawrence Graduate Student, Department of Psychology, Dalhousie University Website: http://myweb.dal.ca/mc973993 Public calendar: http://icalx.com/public/informavore/Public "The road to wisdom? Well, it's plain and simple to express: Err and err and err again, but less and less and less." - Piet Hein ______________________________________________ R-help@stat.math.ethz.ch 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.