Assertion: experiment's variable | /r/HasProperty | held constant
Facets:
value: throughout an investigation
type: TEMPORAL
Source sentences:
text: Also, because natural experiments usually take place in uncontrolled environments, variables from undetected sources are neither measured nor held constant, and these may produce illusory correlations in variables under study.
text: The controlled variable is kept constant so the changes in other variables can be observed more easily.
text: As the name implies, controlled variables are factors that are controlled or held constant throughout an investigation.