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somethinga9230k 3 points ago +4 / -1

Percentile is greater-than, and percentile rank is less-than-or-equal, right?

So:

- n'th percentile: x > n% - percentile rank n: x <= n%

As a side-note, I cannot hear what the person says initially before saying "Trump".

EDIT: The nomenclature of these definitions seems a bit weird to me. I wonder what the origins of them are.

EDIT2: I think my questions and description above is wrong, and that Ladimir_Wewtin is wrong about parts as well, at least from semi-quick glancing and consideration based on Wikipedia.

The "n'th percentile" does not refer to a range, but to a specific value, where n% of cases fall below that value, and (100%-n%) of cases fall above that value. The "n'th percentile" for a given distribution is a value. If a value is ___ at ___ the n'th percentile, it means that this value divides the given distribution with n% of cases below and (100%-n%) above.

Furthermore, saying that a value is ___ in ___ the n'th percentile means that that value is equal to or below the value of the n'th percentile. Which means that (if my understanding is correct) Ladimir_Wewtin is wrong about this latter part: "If you're in the 99th percentile, you scored higher than everyone else, meaning top 1%." . If your score is in the 99th percentile, your score is lower than the interval of values of the top 1% scores.

I do not know what percentile rank refers to - I am not certain that Wikipedia is even consistent reg. the definitions (at a semi-quick glance, the definitions of percentile rank in different pages there might be inconsistent...).

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deleted 1 point ago +1 / -0
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somethinga9230k 1 point ago +1 / -0

Yes, and I also describe that in my "EDIT2" section, namely that if a value is ___ in ___ the n'th percentile, it is equal to or below the value of the n'th percentile. Which, for your example, given that it uses ___ in ___ , not ___ at ___ , would mean that the given boy is not especially tall nor has an especially high weight.

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deleted 1 point ago +1 / -0
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somethinga9230k 1 point ago +1 / -0

Could you describe in which way I am wrong, and/or give any sources reg. it?

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somethinga9230k 1 point ago +1 / -0

The source I am using myself is this page https://en.wikipedia.org/wiki/Percentile , with for instance:

The term percentile and the related term percentile rank are often used in the reporting of scores from norm-referenced tests. For example, if a score is at the 86th percentile, where 86 is the percentile rank, it is equal to the value below which 86% of the observations may be found (carefully contrast with in the 86th percentile, which means the score is at or below the value below which 86% of the observations may be found—every score is in the 100th percentile).

Though Wikipedia is of course often extremely wrong and/or intentionally extremely dishonest and manipulative.