Ranking and selecting by positions

[JGARIN]

Hi,

I have the following problem. I have a sample of merchandise movements between different stores and the time (in minutes) that took those movements (reaction time), this is due to higher demand than planned so we have to move inventory between stores.

So, one of my KPI is the reaction time that covers the 90% of my movements. So technically I have to rank all of my movements in a given period of time, and select the one that covers the 90% of them. This KPI is measured by city, state and per country so the ranking has to be dinamic so the indicator has to recalculate depending of what you are looking.

Kind Regards