[R] Chi-square test

David Winsemius dwinsemius at comcast.net
Sat Jan 21 06:31:28 CET 2017

> On Jan 20, 2017, at 7:36 AM, Sergio Ferreira Cardoso <sergio.ferreira-cardoso at umontpellier.fr> wrote:
> Dear all, 
> Anova() for .car package retrieves Chi-square statistics when I'm testing a model the significance of a multivariate .gls model gls(x~1+2+3+x,corBrownian(phy=tree), ...). 
> Is this Chi-square a two-sided test? 
If you explain what you mean by a "2-sided test" we might be able to help. It’s unlikely that the author set up the test so that it would fail when the fit was so good that the chi-square statistic was very small, but it’s also likely that departures from the implicit hypothesis of all the coefficients being identity 0 would have raised the chi-square statistic away from zero.

> Thank you. 
> Best, 
> Sérgio. 
> 	[[alternative HTML version deleted]]
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David Winsemius, MD
Alameda, CA, USA

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