Hello, When plotting the results of a TukeyHSD multiple comparisons procedure with an ANOVA (lm) object, an extra line appears in the confidence intervals that contain 0. For example (this is straight from the TukeyHSD helpfile):
> summary(fm1 <- aov(breaks ~ wool + tension, data = warpbreaks)) > TukeyHSD(fm1, "tension", ordered = TRUE) > plot(TukeyHSD(fm1, "tension")) An extra line segment appears in the interval to the right of the dotted zero line. Coincidentally, if all of the calculated intervals for a dataset don't contain zero, this isn't a problem -- so I guess the line segment "belongs" to the zero line. I checked R Search and didn't find this mentioned before... but please let me know if I overlooked something. Jason R 2.2.0 on Windows -- BTW, the error didn't happen on my Mac OSX w/ R 1.9.1 -- Assistant Professor of Statistics Mathematics and Computer Science Department University of Richmond, Virginia 23173 (804) 289-8081 fax:(804) 287-6664 http://www.mathcs.richmond.edu/~wowen "This is R. There is no if. Only how." Simon (Yoda) Blomberg ______________________________________________ R-help@stat.math.ethz.ch 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.
