When many variables are involved and theory is undeveloped, the only way to identify interactions is to perform cross-tabulation on all conceivable combinations of variables.

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Cross-tabulation on all conceivable combinations of variables is not the only way to identify interactions when many variables are involved and theory is undeveloped. Other methods such as statistical modeling and experimentation can also be used.

When Many Variables Are Involved and Theory Is Undeveloped, the Only