Dear Johan, > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On > Behalf Of Johan Steen > Sent: August-23-10 3:02 PM > To: r-help@r-project.org > Subject: [R] extracting p-values from Anova objects (from the car library) > > Dear all, > > is there anyone who can help me extracting p-values from an Anova object > from the car library? I can't seem to locate the p-values using > str(result) or str(summary(result)) in the example below > > > A <- factor( rep(1:2,each=3) ) > > B <- factor( rep(1:3,times=2) ) > > idata <- data.frame(A,B) > > fit <- lm( cbind(a1_b1,a1_b2,a1_b3,a2_b1,a2_b2,a2_b3) ~ sex, > data=Data.wide) > > result <- Anova(fit, type="III", test="Wilks", idata=idata, idesign=~A*B) > > > Any help would be much appreciated!
I'm afraid that the answer is that the p-values aren't easily accessible. The print method for Anova.mlm objects just passes through the object invisibly as its result, as is conventional for print methods. The summary method does the same -- that isn't conventional, but the summary method can produce so many different kinds of printed output (various multivariate test criteria for models with and without repeated measures; for the latter, multivariate and univariate tests with and without corrections for non-sphericity) that the printed output is produced directly rather than put in an object with its own print method. What you can do is take a look at car:::print.Anova.mlm or car:::summary.Anova.mlm (probably the print method, which is simpler) to see how the p-values that you want are computed and write a small function to return them. I hope this helps, John -------------------------------- John Fox Senator William McMaster Professor of Social Statistics Department of Sociology McMaster University Hamilton, Ontario, Canada web: socserv.mcmaster.ca/jfox > > > Many thanks, > > Johan > > ______________________________________________ > R-help@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. ______________________________________________ R-help@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.
