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Instruments
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Definition of Instruments: When regressors are correlated to errors in a model, one may be able to replace the regressors by estimates for these regressors that are not correlated to the errors. This is the technique of instrumental variables , and the replacement regressors are called instruments.

The replacement regressors are constructed by running regressions of the original regressors on exogenous variables that are called the instrumental variables. (Econterms)

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