# Monthly Archives: February 2016

## 21 Reasons Why You Should Never Date an Economist

Even though this list has been around for quite a while (I think inesad.edu.bo posted it first in autumn 2012), I think it just doesn’t get old. On the contrary each time I read through it, I just can’t stop … Continue reading

## Linear Regression in R

R presents various ways to carry out linear regressions. The most natural way is to use the lm() function, the R build-in OLS estimator. In this post I will present you how to use lm() and run OLS on the … Continue reading

## Construct the OLS estimator as a function in R

This post shows how to manually construct the OLS estimator in R (see this post for the exact mathematical derivation of the OLS estimator). In contrary to a previous post, this post focuses on setting up the OLS estimator as a … Continue reading

Posted in Computing and Others, Econometrics | 2 Comments

## Calculate OLS estimator manually in R

This post shows how to manually construct the OLS estimator in R (see this post for the exact mathematical derivation of the OLS estimator). The code will go through each single step of the calculation and estimate the coefficients, standard errors … Continue reading

Posted in Computing and Others, Econometrics | 2 Comments

## CLRM – Assumption 5: Normal Distributed Error Terms in Population

Assumption 5 is often listed as a Gauss-Markov assumption and refers to normally distributed error terms in the population. Overall, assumption 5 is not a Gauss-Markov assumption in that sense that the OLS estimator will still be the best linear unbiased estimator (BLUE) … Continue reading

Posted in Econometrics | 5 Comments

## Violation of CLRM – Assumption 4.1: Consequences when the expected value of the error term is non-zero

Violating assumption 4.1 of the OLS assumptions, i.e. , can affect our estimation in various ways. The exact ways a violation affects our estimates depends on the way we violate . This post looks at different cases and elaborates on … Continue reading

Posted in Econometrics | 1 Comment

## CLRM – Assumption 4: Independent and Identically Distributed Error Terms

Assumption 4 of the four assumption required by the Gauss-Markov theorem states that the error terms of the population are independent and identically distributed (iid) with an expected value of zero and a constant variance . Formally,

Posted in Econometrics | 11 Comments