Assertion: independent variable | /r/HasProperty | manipulated by the researcher
Facets:
value: often
type: TEMPORAL
Source sentences:
text: The independent variable is the core of the experiment and is isolated and manipulated by the researcher.
text: They are either manipulated by the researcher or are observed by the researcher so that their values can be related to that of the dependent variable.
text: While the independent variable is often manipulated by the researcher, it can also be a classification where subjects are assigned to groups.
text: It is the consequent variable that is presumably affected by one or more independent variables that are either manipulated by the researcher or observed by the researcher and regarded as antecedent conditions that determine the value of the dependent variable.