On Wed, 2010-08-18 at 00:42 -0700, Stephen Liu wrote: > Hi folks, > > > Where can I find document re "how to read anova output"? Google found many > of > them. But seemingly non of them can explain to me following output:- > > > > tabA = c(5.67, 5.67, 5.55, 5.57) > > tabB = c(5.75, 5.47, 5.43, 5.45) > > tabC = c(4.74, 4.45, 4.65, 4.94) > > tabs = data.frame(tabA, tabB, tabC) > > > tablets = stack(tabs) > > > > anova(lm(values ~ ind, data = tablets)) > Analysis of Variance Table > Response: values > Df Sum Sq Mean Sq F value Pr(>F) > ind 2 2.05787 1.02893 45.239 2.015e-05 *** > Residuals 9 0.20470 0.02274 > --- > Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
That output is designed to look like ANOVA tables from classical text books, so any introductory textbook designed for your particular background or area of knowledge would probably help you understand it. Many of the R books that do introductory stats aren't really concerned with teaching the stats side of things so might not go into much detail explaining the table, assuming that this is covered elsewhere. There will be exceptions of course. HTH G > > > TukeyHSD(aov(values ~ ind, data = tablets)) > Tukey multiple comparisons of means > 95% family-wise confidence level > Fit: aov(formula = values ~ ind, data = tablets) > $ind > diff lwr upr p adj > tabB-tabA -0.09 -0.3877412 0.2077412 0.6866791 > tabC-tabA -0.92 -1.2177412 -0.6222588 0.0000321 > tabC-tabB -0.83 -1.1277412 -0.5322588 0.0000731 > > > Please help. TIA > > > B.R. > Stephen L > > > > ______________________________________________ > 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. -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Dr. Gavin Simpson [t] +44 (0)20 7679 0522 ECRC, UCL Geography, [f] +44 (0)20 7679 0565 Pearson Building, [e] gavin.simpsonATNOSPAMucl.ac.uk Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/ UK. WC1E 6BT. [w] http://www.freshwaters.org.uk %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% ______________________________________________ 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.
