This article comes from Joon Im, a student in Business Science University. Joon has completed both the 201 (Advanced Machine Learning with H2O) and 102 (Shiny Web Applications) courses. Joon shows off his progress in this Web Scraping Tutorial with rv...

Are you interested in guest posting? Publish at DataScience+ via your RStudio editor. Category Advanced Modeling Tags caret Classification Prediction R Programming Shiny With the BMuCaret Shiny app post you can perform Caret-models comparison and find the best one, which achieves the best performance for a given data set. But ...

tl;dr I was recently perusing several journals in psychology, looking for examples of bad graphics. One would think such an exercise would be quite simple. People are generally really bad at creating graphics. But the problem was worse than I thought.

Some time ago I developed a little project that collects Aussie politicians tweets and present several visualizations. It’s available at https://rserv.levashov.biz/shiny/rstudio/ That time I has quite generous credits from AWS, so haven’t worried too much about costs. Unfortunately credits are about to expire, ...

Intro Maximum likelihood estimation is a very useful technique to fit a model to data used a lot in econometrics and other sciences, but seems, at least to my knowledge, to not be so well known by machine learning practitioners (but I may be wro...

I’m after an exhausting yet exciting weekend with the WhyR? conference. That was the third edition, this year held in Warsaw, and it is nice to see how it grows each year. The Appsilon Data Science team really appreciates the initiative and the professionalism of organisation, thus we decided ...

Statistical/Machine learning model calibration with crossval

Bayesian Aggregation Yang, Y., & Dunson, D. B., Minimax Optimal Bayesian Aggregation 2014 (arXiv) Say we have a number of estimators \(\hat f_1, \ldots, \hat f_K\) derived from a number of models \(M_1, \ldots, M_K\) for some regression problem \(Y = f(X) + \epsilon\), but, as is the nature of things ...

Y otra vez me arranco despacito, al sentir que nada necesito (Locura transitoria, Extremoduro) One of my favorite sites in the Internet is algorithmic botany . It’s always a source of inspiration for me. I recently discovered there the space colonization algorithm, concretely in this paper. Originally, the algorithm was ...