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Re: How to plot linear regression relation of two array? [message #65041 is a reply to message #65040]

Mon, 09 February 2009 13:20

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Hu writes:

> Yes, I use function linfit() to get the parameters a and b (Y=3Da+b*X)
> But How can I get the R^2 ?

R is the correlation coefficient. I typically get
it from CORRELATE:

params = LinFit(x, y, /DOUBLE)
r = Correlate(x, y, /DOUBLE)
r_sqrd = r^2

You can put it on to your plot with XYOUTS:

XYOUTS, 0.1, 0.9, /NORMAL, 'R^2 = ' + $
StrTrim(String(r_sqrd, FORMAT='(F8.2)'),2)

Cheers,

David

--
David Fanning, Ph.D.
Coyote's Guide to IDL Programming (www.dfanning.com)
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: How to plot linear regression relation of two array? By: Vince Hradil on Mon, 09 February 2009 15:09
		Re: How to plot linear regression relation of two array? By: pgrigis on Mon, 09 February 2009 14:39
		Re: How to plot linear regression relation of two array? By: Hu on Mon, 09 February 2009 13:21
		Re: How to plot linear regression relation of two array? By: David Fanning on Mon, 09 February 2009 13:20
		Re: How to plot linear regression relation of two array? By: Vince Hradil on Mon, 09 February 2009 13:13
		Re: How to plot linear regression relation of two array? By: Hu on Mon, 09 February 2009 12:51
		Re: How to plot linear regression relation of two array? By: Hu on Mon, 09 February 2009 12:42
		Re: How to plot linear regression relation of two array? By: Vince Hradil on Mon, 09 February 2009 12:12

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