100 : Percentile :: 9 : ?
There doesn't appear to be a common term for the 9-quantile. What are your thoughts on this analogy? Am I on the right track? If it said 8 or 10 I would answer octile or decile, respectively, but I'm not sure since it's 9.
There's just something slightly unsatisfying about that answer. I feel like nonile is more of a neologism than is warranted by the question and that a more succinct answer is out there.
It's definitely a legitimate question. All of the other analogies in the group I saw online made sense and had one perfect answer...except this one.