Dendextend Bk plot

Question

My apologies if this question is trivial but I am having a problem to interpret the Bk plot from dendextend. There are 3 lines there: dented one to show FM index for every k, then red solid one and dashed black one. What are those last two lines? I thought that they represents the critical value of FM index under H0 but the values not sems to match... Could you help please?

Answer 1

The middle value indeed is the expected FM value under H0, while the other two lines are the approximate confidence intervals of that value. You can see the original paper for more details: http://wildfire.stat.ucla.edu/pdflibrary/fowlkes.pdf