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The top 25% is the top quartile. The top 10% is the top decile. The top 1% is the top percentile.

Is there a term for the equivalent for the top 0.5%, i.e. 1-in-200?

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    Top 200-quantile? You can see this to know about the q-quantiles that have special names. – Nagarajan Shanmuganathan Sep 16 '16 at 13:07
  • OK. Your ref to wikipedia suggests that the word does not exist. Thanks – Mr T Sep 16 '16 at 13:23
  • Yes, the link doesn't have a special name for what you've asked for. That is why I gave my own suggestion as 200-quantile. – Nagarajan Shanmuganathan Sep 16 '16 at 13:33
  • Actually, the top 1 percent is 99th percentile. We don't say top percentile, percentile is always rank ordered bottom to top. – Phil Sweet Sep 16 '16 at 17:22
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I guess you could say a "half-percentile".

  • See my comment above, it would be ninety-nine-and-one-half percentile. – Phil Sweet Sep 16 '16 at 17:26
  • I would go decimal, for example, top 99.5 percentile. – aparente001 Sep 16 '16 at 19:35

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