Assertion: variable | /r/HasProperty | constant
Facets:
value: for each group
type: TRANSITIVE-OBJECT
Source sentences:
text: So that the variable will be kept constant or monitored to try to minimize its effect on the experiment.
text: To ensure the measured effect is not influenced by external factors, other variables must be held constant.
text: the variable is kept constant, or "standardized," for each group.