nulls
Database absent values
Nulls are zero values, empty placeholders, or things that have been voided.
In computing, a null represents the absence of data—distinct from zero or blank, it means "no value assigned." In statistics, the null hypothesis assumes no significant difference exists.
As a verb form, to null something is to cancel or invalidate it: The court nulls the contract.
The singular null also functions as an adjective: a null result, null and void.
Not present, whereabouts unknown
- blankWithout marks or content
- incompleteLacking necessary parts
- gapUnfilled space between
- placeholderTemporary position marker
imputation · dataset · spreadsheet · database · field · record · cleaning · preprocessing
Not clearly delineated
- NaNUnrepresentable numerical value
- voidWithout legal effect
- nilNothing whatsoever
- emptyHolding nothing inside
nullable · exception · default · sentinel · placeholder · initialization · unassigned · optional
Without legal effect
- invalidWithout legal force
- invalidationAct of nullifying
- unenforceableLacking legal force
- cancelledOfficially called off
revoked · vacated · rescinded · overturned · defunct · abolished · negated · repealed
Absent information in datasets
- imputationAscribing fault to another
- biasUnfair inclination or prejudice
- estimationApproximate value judgment
- surveySystematic data collection
nonresponse · coding · dummy · indicator · handling · analysis · treatment · pattern
missing
Not present, whereabouts unknown
- blankWithout marks or content
- incompleteLacking necessary parts
- gapUnfilled space between
placeholder · imputation · dataset · spreadsheet · database · field · record · cleaning · preprocessing · absent
undefined
Not clearly delineated
empty · nullable · exception · default · sentinel · placeholder · initialization · unassigned · optional · dereference
void
Without legal effect
- invalidWithout legal force
- invalidationAct of nullifying
- unenforceableLacking legal force
cancelled · revoked · vacated · rescinded · overturned · defunct · abolished · negated · repealed · quashed
missing data
Absent information in datasets
- imputationAscribing fault to another
- biasUnfair inclination or prejudice
- estimationApproximate value judgment
survey · nonresponse · coding · dummy · indicator · handling · analysis · treatment · pattern
- null and voidWithout legal effect
- jury nullificationPanel ignores law, acquits
- null hypothesisAssumed no relationship exists
- null setCollection with nothing inside
annul, nullify, null, annulment, nullification, nullity, nullified, nullifying, nullifies