Are these conditions must be met for a Valid instrument?it must be (1) correlated with the included endogenous variable and (2) exogenous.

ENGR.ECONOMIC ANALYSIS
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Author:NEWNAN
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Chapter1: Making Economics Decisions
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Are these conditions must be met for a Valid instrument?it must be

(1) correlated with the included endogenous variable and

(2) exogenous.

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Valid Instrument -  A valid instrument induces changes in the explanatory variable but has no independent effect on the dependent variable.

Conditions which must be met for a valid instrument 

1. correlated with the included endogenous variable - We use valid instrument when there is correlation between the endogenous variable which means we can check the affect variable with out omitting variable due to correlation 

2. Exogenous - It is used when an explanatory variable of interest is correlated with the error term.

So, both condition should be met 

 

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