I'm trying to combine percentiles (50th and 90th) from 2 different datasets. I don't have access to the datasets at the time of combining. Apart from the percentiles I have the number of elements on each dataset.
Now, I know that any attempt at combining them will be only an approximation to the real percentile of the combined datasets, but I just want to know what would be the "most" correct solution.
The options I was considering were: - Weighted average - Take the percentile for the biggest dataset
The output will be used to build a graph, as I get these percentiles periodically.