This document walks through the detection of heteroskedasticity in a multivariate OLS regression using the mtcars dataset. We estimate a regression of fuel efficiency on horsepower, weight, and displacement, visually inspect residual plots, run White's test via bptest(), and manually replicate the test statistic using an auxiliary regression and a chi-squared test.

This interactive plot showing housing prices was created with plot_ly

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Instructivo para la instalación de R y Rstudio y descripción de Posit Cloud para su uso desde la web.