When there are a large number of independent variables and the researcher suspects that not all of them are significant,stepwise regression should be used.

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Stepwise regression is a useful method for selecting a subset of variables that are most relevant in explaining the variation in a dependent variable when there are a large number of independent variables. It involves adding or removing variables from the model one at a time based on their statistical significance, until no more significant variables can be added or removed.

When There Are a Large Number of Independent Variables and the Researcher