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2 Clarified question, added tag
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Why do we need to include precision variables in a regression model (ai.e., a variable that is associated with the outcome but not the predictor of interest)?

Why do we need to include precision variables in a model (a variable that is associated with the outcome but not the predictor of interest)?

Why do we need to include precision variables in a regression model (i.e., a variable that is associated with the outcome but not the predictor of interest)?

1
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What is the purpose of precision variables?

Why do we need to include precision variables in a model (a variable that is associated with the outcome but not the predictor of interest)?