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However AFAICT, the only difference between the two sets of results (re. main effects present in both) is that the residual df differs, hence so does F and p-value. -pd > On 15 May 2016, at 21:06 , Jonathan Reardon <jonathanrear...@outlook.com> > wrote: > > Hello, > > I ran a 2x2x2 repeated measures ANOVA which turned out fine: > Df Sum Sq Mean Sq > F value Pr(>F) Attend 1 0.5540 > 0.55402 7.0374 0.01079 *PercGrp 1 > 0.0058 0.00580 0.0737 0.78719 Pres > 1 0.1794 0.17944 2.2794 0.13766 > Attend:PercGrp 1 0.0017 0.00172 0.0218 > 0.88324 Attend:Pres 1 0.0189 0.01894 > 0.2406 0.62598 PercGrp:Pres 1 0.0534 > 0.05344 0.6789 0.41405 Attend:PercGrp:Pres 1 0.0046 > 0.00464 0.0590 0.80912 Residuals 48 > 3.7788 0.07872 > However, when I run the interactions alone (from the same dataset), I get a > different set of results than what was originally shown e.g. >> anova(lm(main~Attend+PercGrp+Pres))Analysis of Variance Table > Response: main Df Sum Sq Mean Sq F value > Pr(>F) Attend 1 0.5540 0.55402 7.4682 0.008561 > **PercGrp 1 0.0058 0.00580 0.0782 0.780849 Pres > 1 0.1794 0.17944 2.4189 0.125942 Residuals 52 > 3.8575 0.07418 > I also get different results when i run the interactions alone too. Curious > to know why this is. > Thanks,Jon > > > > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. -- Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Office: A 4.23 Email: pd....@cbs.dk Priv: pda...@gmail.com ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
