Monthly Archives: April 2018

Econometrics, Statistics

Omitted Variable Bias: Violation of CLRM–Assumption 3: Explanatory Variables must be exogenous

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One reason why the omitted variable leads to biased estimates is that omitting a relevant variable violates assumption 3 of the necessary assumptions of the classical regression model that states that all explanatory variables must be exogenous, i.e.

E(\epsilon_{i}|X)=0

From this post, we know that omitting a relevant variable from the regression causes the error term and the explanatory variables to be correlated.
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Computing and Others, Econometrics

Linear Regression in Julia

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Unfortunately, linreg() is deprecated and no longer exists in Julia v1.0. In case you are using Julia v1.0 or above, check out this post. In case you use a version of Julia that is older than 1.0, i.e 0.7, 0.6, etc., the following post will show you how to run a linear regression in Julia.

Julia presents various ways to carry out linear regressions. In this post I will present how to use the native function linreg() to run OLS on the following model

y = \alpha + \beta_{1} x_{1}

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