Intervals displayed in multcompare function

Hi, Could someone tell me what the intervals are that are displayed in the interactive figure resulting from the multcompare function? Are they confidence intervals? Also, is there a way to get the specific numbers for these intervals? The help section is a bit vague on exactly what these intervals are.

Answer 1

[the cyclist]

This is a case in which the output from help is a bit better than that of doc. From

help multcompare

says

"The intervals shown in the graph are computed so that to a very close approximation, two estimates being compared are significantly different if their intervals are disjoint, and are not significantly different if their intervals overlap. (This is exact for multiple comparison of means from anova1, if all means are based on the same sample size.) You can click on any estimate to see which means are significantly different from it."

By default, this is based on the Tukey-Kramer procedure. You can dig into the code using

edit multcompare

to get the exact details of the calculation.