Graphing between-subject confidence intervals for ANOVA

March 19, 2012

(This article was first published on Psychological Statistics, and kindly contributed to R-bloggers)

This is a quick follow up to my earlier post that discussed how to graph CIs for within-subjects (repeated measures) ANOVA designs. My forthcoming book Serious stats describes how to do this for between-subjects designs (a much simpler problem). The blog that accompanies the book now has a post summarizing the main options and explaining how to plot difference-adjusted CIs (95% CIs constructed so that non-overlapping intervals correspond to a statistically significant difference between means at p < .05). In addition, the post includes R functions to calculate and plot difference-adjusted CIs (though the calculations are not difficult to reproduce by hand).

UPDATE: I’ve now added functions for two-tiered CIs for between-subjects designs on the book blog. More generally my functions for the book, CIs for ANOVA and a few other things are all available here. I plan to update these functions regularly to add functionality and deal with any undocumented features.

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