What is Norm group?
Also called Normative sample, Comparison group, Norms
A norm group is the reference sample a raw score is compared against in order to produce a percentile or standard score. The same performance can be an unremarkable result against one norm group and an exceptional one against another, which makes the identity, size and date of the norm group part of the score itself.
The most important line in a score report, and usually the smallest
A percentile is meaningless without knowing who it is a percentile of. 'Better than 85% of people' is a different claim from 'better than 85% of applicants to graduate schemes at large financial firms in 2019', and only the second is actually being made.
Ask four things of any published norm: who is in it, how many of them there are, when it was collected, and whether it is an applicant sample or an incumbent sample. Incumbent norms are drawn from people who already passed selection, so they are systematically stronger and will flatter nobody.
When there is no norm group at all
Sometimes the honest answer is that there isn't one yet, and a small sample is not a norm. A distribution built on a few dozen people gives percentiles that will move substantially when the next few dozen arrive.
The alternatives are legitimate and should be labelled as what they are: a criterion-referenced result reported against a defined standard rather than against other people, or a cohort comparison stated explicitly as a position within this particular applicant pool.
Not the same as cohort comparison
A norm group is a standing reference sample collected in advance. A cohort comparison ranks a person within the specific group that applied alongside them, and it changes every time the pool does.
How AssessAll handles it
Worth being precise about, because vagueness here is the norm in this market: the percentile shown in AssessAll's structured hiring screen is a cohort percentile — the percentage of scored candidates in that same pipeline at or below the candidate (lib/hiring/screening.ts). It is not a national or industry norm and is not presented as one. Where a result is reported against a fixed standard instead, as in AssessAll Certified, it is criterion-referenced and no norm group is involved.
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