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Re: Can IDL calculate the confidence level about correlation [message #56890 is a reply to message #56888]

Thu, 22 November 2007 17:51

wanglin1981
Messages: 10
Registered: August 2007

Junior Member

I found a code which can calculate the confidence level using pvalue
method (see below). It works well, but usually I use the Student's t-
test method. So can anyone help?

Thanks!

r=correlate(x,y)
var=1/(n-3.0)
zvalue = 0.5*alog((1+r)/(1-r))/sqrt(var)
if (zvalue lt 0) then pvalue = 2*(gauss_pdf(zvalue)) $
else pvalue = 2*(1-gauss_pdf(zvalue))

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[Message index]

		Re: Can IDL calculate the confidence level about correlation By: wanglin1981 on Fri, 23 November 2007 17:30
		Re: Can IDL calculate the confidence level about correlation By: wanglin1981 on Fri, 23 November 2007 17:28
		Re: Can IDL calculate the confidence level about correlation By: Mike[2] on Fri, 23 November 2007 15:25
		Re: Can IDL calculate the confidence level about correlation By: Vince Hradil on Fri, 23 November 2007 13:02
		Re: Can IDL calculate the confidence level about correlation By: yp on Fri, 23 November 2007 04:06
		Re: Can IDL calculate the confidence level about correlation By: wanglin1981 on Thu, 22 November 2007 17:51
		Re: Can IDL calculate the confidence level about correlation By: Brian Larsen on Sat, 24 November 2007 06:25

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