Percentiles for each page name

I believe that percentile is calculated using all the rows of data (sort of like how Mean calculates the average for all the rows).

Most times I’ve seen percentile used, the breakdown is time so that it gets you the “25th Percentile” across the time frame… 

If you need it for each Page Name, you might have to try something like creating a dynamic dropdown on the panel, and selecting “Business” or “Calculating”, etc to see the percentile for the date range for each specific value? 

Yes, like Jen said, the percentile works based off of the rows and identifies the value at the kth percenti,e that you specify. 

Can you explain more about what you're actually trying to accomplish and I might be able to help you figure out a workaround? I know you said something about person or session scope, but that isnt really how the metrics work (thats how segments work). So more detail on your end goal would be helpful. There's a lot of nuances to the functions in the calculated metric builder. I have this guide here i wrote that might be able to provide some guidance too.

https://experienceleague.adobe.com/en/perspectives/calculated-metrics-playbook-your-one-stop-shop-for-every-metric