Reference line issue

[#1]

I am trying to use a reference line for the maximum influence rank. I have names on the y axis and rank on the x axis. Its a vertical bar chart. I dont want to just put a number in the expression where reference line is calculated as it can move. Also I dont want to have the reference line moves if I click on a name  but I want it to be static at the Max rank all the time so as to compare. Any help is much appreciated? I have used this expression but with no luck

Max(aggr(Name,CommentPostCount))

[#2]

Oops sorry the expression I used is Max(aggr(Name,Comment/PostCount)). Forgot to add the division line. But still doesnt works.

[Gysbert_Wassenaar · Accepted solution]

If your expression is sum(Something) then the expression for the reference line could be max({1}aggr(sum({1}Something), Name)). If you use a different expression for your y-axis values then replace it with that. Just add the {1} to ignore the selections.

[#4]

Your earlier post made it work Gysbert. Max({1}Comment/PostCount)

Could you explain what exactly its doing? Is it just taking the max and keeping the first entry always?

[#5]

Thanks a lot BTW. Much appreciated.