Explains a pooled rate as the weighted mean of its population rates
https://knobit.org/id/knobit/Q-1901
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| Context functions | Object understanding |
|---|---|
| Knobit creation methods | AI generated |
| Knobit creation methods | AI generated, AI edited |
| Knobit types | Knowledge |
| LCG purposes | Assessing the learner's knowledge or skill state |
| LCG purposes | Opening up a learning outcome |
| action verb | Explains en |
| assessment criterion | Computes a pooled rate from population rates and sizes, tells it from the plain mean of the rates, and names the mix effect en |
| assessment method | Multiple-choice question en |
| conforms to profile | https://oppekava.edu.ee/a/Knobitite_kirjeldamise_ja_seostamise_reeglid#LCG-KNOBIT-0.1 |
| dcterms:identifier | Q-1901 |
| dcterms:identifier | W-1901 |
| dcterms:license | https://creativecommons.org/licenses/by/4.0/ |
| dcterms:source | Part B candidate of k12-dmbok for activity QO-4 (a need for school knowledge no knobit of the activity reached), accepted by Peep Küngas on 31 Oct 2026 en |
| dcterms:source | Shared-URI copy of data-quality Q-1901, for activity WO-2 (k12-dmbok part B candidate, accepted by Peep Küngas on 31 Oct 2026) en |
| depends on knobit | Explains the concept of the arithmetic mean |
| expected result | The pooled rate as the size-weighted mean of the population rates, with the mix effect it can hide en |
| owl:sameAs | https://bitbucket.org/reffa/ontology/id/knobit/data-quality/04-profiling-assessment/Q-1901 |
| rdfs:label | Explains a pooled rate as the weighted mean of its population rates en |
| schema:creativeWorkStatus | accepted |
| schema:isPartOf | Data quality management (DAMA-DMBOK2) |
| schema:isPartOf | Data warehousing and business intelligence (DAMA-DMBOK2) |
| skos:definition | A rate over several populations is the mean of their rates weighted by their sizes (denominators), not their plain average; a small poor population can hide in it, and a shift in the population mix moves it with no change in any population's quality. en |
| skos:prefLabel | Explains a pooled rate as the weighted mean of its population rates en |
| target object | pooled rate over several populations en |
Used by
| applies knowledge | Recognises one quality ratio over differing populations |
|---|---|
| applies knowledge | Recognises a quality trend read without its population change |
| applies knowledge | Recognises a ratio averaged across segments |
| applies knowledge | Recomputes a ratio from summed numerators and denominators |
| depends on knobit | Explains like-for-like trends of quality measures |
| depends on knobit | Explains additivity of facts |
| includes knobit | Profiles and assesses critical data elements over stated populations |
| includes knobit | Defines each KPI once, precisely enough to compute, and explains two values of it in numbers |
| requires knobit | Profile and assess data quality |
| requires knobit | Define metrics and KPIs |