due to the addition of

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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Please provide an explanation for each option and justify your choice. Which problem can arise due to the addition of unnecessary control variables in a regression model?

(a) We might decrease the precision of our estimates when adding highly correlated covariates.

(b) We might not want to hold the levels of some control variables fixed to allow for them to vary in response to changes in variables of interest.

(c) A model that may be suited for a particular research question may contain control variables that make no sense in the context of another research question.

(d) All of the above.

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