you have only 1 df for tryptophan. make it a factor and then all shoukd work.
Sent from my iPhone > On Mar 21, 2014, at 12:38, Valentina Lauria <valentina.lau...@plymouth.ac.uk> > wrote: > > > Dear R list, > > I am trying to fit a one way anova with just one factor and 3 levels. One of > my levels is significant > >> av2<-aov(site~Tryptophan, data=datafit) >> summary(av2) > Df Sum Sq Mean Sq F value Pr(>F) > Tryptophan 1 155.3 155.32 5.875 0.025 * > Residuals 20 528.8 26.44 > --- > Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1 > > But when I try to compute the Tukey test I get this strage warning message > and no values but only NANs > > >> summary(aov(Tryptophan~as.factor(site), data=datafit)) > Df Sum Sq Mean Sq > as.factor(site) 21 31394 1495 > >> test<-TukeyHSD(aov(Tryptophan~factor(site), data=datafit)) > Warning message: > In qtukey(conf.level, length(means), x$df.residual) : NaNs produced > >> test > Tukey multiple comparisons of means > 95% family-wise confidence level > > Fit: aov(formula = Tryptophan ~ factor(site), data = datafit) > > $`factor(site)` > diff lwr upr p adj > 2-1 -103.70 NaN NaN NaN > 3-1 -119.85 NaN NaN NaN > 4-1 20.40 NaN NaN NaN > 5-1 -70.24 NaN NaN NaN > 6-1 7.16 NaN NaN NaN > 7-1 22.57 NaN NaN NaN > 8.1-1 11.10 NaN NaN NaN > 8.2-1 -13.38 NaN NaN NaN > 9-1 -5.55 NaN NaN NaN > 10-1 -8.88 NaN NaN NaN > 11-1 -4.21 NaN NaN NaN > 12-1 19.92 NaN NaN NaN > 13-1 10.89 NaN NaN NaN > 14.1-1 8.85 NaN NaN NaN > 14.2-1 -0.15 NaN NaN NaN > 15-1 21.76 NaN NaN NaN > 16-1 12.45 NaN NaN NaN > > etc etc... > > Could anyone help me or point me to the right direction? > > Thank you very much in advance. > > Kind Regards, > Valentina > > This email and any files with it are confidential and intended solely for the > use of the recipient to whom it is addressed. If you are not the intended > recipient then copying, distribution or other use of the information > contained is strictly prohibited and you should not rely on it. If you have > received this email in error please let the sender know immediately and > delete it from your system(s). Internet emails are not necessarily secure. > While we take every care, Plymouth University accepts no responsibility for > viruses and it is your responsibility to scan emails and their attachments. > Plymouth University does not accept responsibility for any changes made after > it was sent. Nothing in this email or its attachments constitutes an order > for goods or services unless accompanied by an official order form. > > ______________________________________________ > 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.
