Author Archives: insightr

Basic Quantile Regression

By Gabriel Vasconcelos Introduction Today we are going to talk about quantile regression. When we use the lm command in R we are fitting a linear regression using Ordinary Least Squares (OLS), which has the interpretation of a model for … Continue reading

Posted in R | Tagged , , , , , | 4 Comments

Structural Analisys of Bayesian VARs with an example using the Brazilian Development Bank

By Gabriel Vasconcelos Introduction Vector Autorregresive (VAR) models are very popular in economics because they can model a system of economic variables and relations. Bayesian VARs are receiving a lot of attention due to their ability to deal with larger … Continue reading

Posted in R | Tagged , , , , , , , | 7 Comments

Benford’s Law for Fraud Detection with an Application to all Brazilian Presidential Elections from 2002 to 2018

By Gabriel Vasconcelos and Yuri Fonseca The intuition Let us begin with a brief explanation about Benford’s law and why should it work as a fraud detector method. Given a set of numbers, the first thing we need to do … Continue reading

Posted in R | Tagged , , , , , , | 5 Comments

BooST series II: Pricing Optimization

By Gabriel Vasconcelos & Yuri Fonseca Introduction This post is the second of a series of examples of the BooST (Boosting Smooth Trees) model. You can see an introduction to the model here and the first example here. Our objective … Continue reading

Posted in R | Tagged , , , , , , , | 6 Comments

Growing Objects and Loop Memory Pre-Allocation

By Thiago Milagres Preallocating Memory This will be a short post about a simple, but very important concept that can drastically increase the speed of poorly written codes. It is very common to see R loops written as follows: This … Continue reading

Posted in R | Tagged , , , , , | 3 Comments

BooST series I: Advantage in Smooth Functions

By Gabriel Vasconcelos and Yuri Fonseca Introduction This is the first of a series of post on the BooST (Boosting Smooth Trees). If you missed the first post introducing the model click here and if you want to see the … Continue reading

Posted in R | Tagged , , , , , , , , | 3 Comments

BooST (Boosting Smooth Trees) a new Machine Learning Model for Partial Effect Estimation in Nonlinear Regressions

By Gabriel Vasconcelos and Yuri Fonseca   We are happy to introduce our new machine learning method called Boosting Smooth Trees (BooST) (full article here). This model was a joint work with professors Marcelo Medeiros and Álvaro Veiga. The BooST … Continue reading

Posted in Publications, R | Tagged , , , , , , , , | 12 Comments