From: derek <jan.kacaba_at_gmail.com>

Date: Thu, 17 Mar 2011 02:08:32 -0700 (PDT)

Date: Thu, 17 Mar 2011 02:08:32 -0700 (PDT)

Exuse me, I don't claim R^2 can't be negative. What I say if I get R^2
negative then the data are useless.

I know, that what Thomas said is true in general case. But in my special
case of data, using nonzero intercept is nonsense, and to get R^2 less than
0.985 is considered poor job (standard R^2>0.995). (R^2 given by R^2 = 1 -
Sum(R[i]^2) / Sum((y[i])^2) )

So I would like to know why two different formulas for R^2 are used?

-- View this message in context: http://r.789695.n4.nabble.com/Strange-R-squared-possible-error-tp3382818p3383992.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.Received on Thu 17 Mar 2011 - 14:05:39 GMT

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