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Jan 18 at 17:13 comment added Nuclear Hoagie Perhaps worth noting that this is only due to the values being averaged, because the N does not work out such that there is any population member at exactly the 90th percentile. This can't happen with exact quantiles - if you set the subgroup and full population sizes to something evenly divisible by the quantile (say 500/500/1000), you'll never find that both subpopulations' 90th quantiles are higher than the full population's.
Jan 18 at 14:08 vote accept sedavidw
Jan 18 at 2:06 history answered wei CC BY-SA 4.0