For the last few months we have been computing and publishing daily forecasts of COVID-19 cases and deaths in Brazil. This is a partnership with a team of professors from the Pontifical Catholic University of Rio de Janeiro and the Getulio Vargas Foundation. The website is in Portuguese. The results can be found in https://covid19analytics.com.br ..read more

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 the conditional mean of on . However, sometimes we may need to look at more than the conditional mean to understand our data and quantile regressions may be a good alternative. Instead of looking at the mean, quantile regressions will establish models for particular quantiles as chosen by the user. The most simple case when quantile regressions are good is w ..read more