It shows how a sp has been performing to other shares whether they are in the same sector or not.
I think comparisons do matter. If a share is underperforming over a longer period then something is clearly wrong. More so in the same sector of course however i see no reason in comparing simiar market caps. Thats what i did here. I agree EKT is not in the same sector but when i started comparing the 2 companies they were on similar markets caps when i started the exercise.