each year ending in a two or a seven, census bureau employees stow away their eponymous decennial population count to focus on the economic census. and when charged with gauging the health of the american economy, who better to survey than busine...

each year ending in a two or a seven, census bureau employees stow away their eponymous decennial population count to focus on the economic census. and when charged with gauging the health of the american economy, who better to survey than busine...

Despite the refreshing change that the journal PLOS ONE represents in terms of open access and an refreshing change to the stupidity that is quality/novelty selection by the two or three people that review a paper, it’s submission requirements are far less progressive. Yes they make you jump through a lot of hoops getting your figures and...

The Metropolis algorithm, and its generalization (Metropolis-Hastings algorithm) provide elegant methods for obtaining sequences of random samples from complex probability distributions. When I first read about modern MCMC methods, I had trouble visualizing the convergence of Markov chains in higher dimensional cases. So, I thought I might put together a visualization in a two-dimensional case. I’ll use...

This morning, Benoit sent me an email, about an exercise he found in an econometric textbook, about linear regression. Consider the following dataset, Here, variable X denotes the income, and Y the expenses. The goal was to fit a linear regression (actually, in the email, it was mentioned that we should try to fit an heteroscedastic model, but let...

The following Github repo has the R code I put together that allows us to follow along and modify the great idea from Scannel & Kurz on app growth and it’s impact on yield. https://github.com/Btibert3/sk-delta-apps-yield/blob/master/README.md Take a look at the repo and feel free to clone it if you want to learn R or add

Types and type conversion can be a tricky and intricate topic, and sometimes can lead to some real head-scratcher issues in R. Hence a somewhat confusing title.This is for people still relatively new to R, and I will skip some gory details. Actually I will skip most of them, the canonical source for type and conversion information is the...