I have run a 1 way basic ANOVA on 4 categorical variables. Afterwards, I ran multiple comparisons on all 4 groups (6 comparisons) & adjusted using the Tukey-Kramer method. This was all done in Matlab.
Now I want to plot a boxplot showing the errorbars of each group adjusted for multiple comparisons - i.e. if the error bars of two groups dont overlap then those groups are significantly different. I know Matlab is able to do this, but I haven't been able to find any resource on HOW this adjustment is performed.
Can anyone point me towards a formula/theory of how to do this by hand?
Thanks!