A new package RcppAnnoy is now on CRAN. It wraps the small, fast, and lightweight C++ template header library Annoy written by Erik Bernhardsson for use at Spotify. While Annoy is setup for use by Python, RcppAnnoy offers the exact same functionality... [Read more...]

In this post I will try to copy the calculations of SAS's PROC MCMC example 61.5 (Poisson Regression) into the various R solutions. In this post Jags, RStan, MCMCpack, LaplacesDemon solutions are shown. Compared to the first post in this series, rcppbugs and mcmc are not used. Rcppbugs has no poisson ... [Read more...]

[Read more...]

My first blog post on Perceivant.comhttp://perceivant.com/causality-time-series-determining-impact-marketing-interventions/ [Read more...]

Salvino A. Salvaggio, PhDNovembre 2014Online da febbraio 2016Sebbene in uno Stato di diritto dovrebbe vigere il doppio obbligo di rispetto della legge e di certezza del diritto, questo nulla toglie al fatto che ci si possa legittimamente porre domande... [Read more...]

[Read more...]

Uruguayan voters are about to give give Frente Amplio a third mandate this November 30th. The following graph shows how the outcome would look like if the election were held this week. The undecided voters were distributed accordingly to each party as by the election day. The picture draws the ... [Read more...]

Substantive expertise makes it into the Data Science Venn Diagram from DataCamp's infographic on how to become a data scientist. It's one of the three circles of equal size along with programming and statistics. Regrettably, substantive expertise ... [Read more...]

The R language has jumped to number 12 in the November 2014 TIOBE Index of programming language popularity. This is R's highest ranking in the history of the TIOBE index, which has been ranking languages since 2003. A high ranking is an impressive achievement for R given that it is a domain-specific language (... [Read more...]

Within 2 weeks, electors in Uruguay will vote for the runoff election between FA and PN. According to the polling data being published, it's very likely Uruguayans will give FA a third mandate. I run the following forecast model which suggest that the difference between the two parties are huge; even ... [Read more...]

First, before starting this post, I’d like to give one last comment about my previous post: I called Vanguard to … Continue reading → [Read more...]

REDDITORS’ BEFORE AND AFTER MEASUREMENTS ANALYZED Click to enlarge How many pounds do you need to lose in order to reduce your waistline by one inch? How many kilos do you need to lose to reduce your waistline by one centimeter? We wanted to find out. We were having trouble ... [Read more...]

Occupancy modeling is possible in Stan as shown here, despite the lack of support for integer parameters. In many Bayesian applications of occupancy modeling, the true occupancy states (0 or 1) are directly modeled, but this can be avoided by marginalizing out the true occupancy state. The Stan manual (pg. 96) gives an ... [Read more...]

Estimated Read Time: Under 5 minutes This is a quick post about a quick little experiment I tried lately. I saw a recent post about how red and blue color scales on political heat maps can be misleading--primarily because human perception is not very good at discriminating between shades of purple ... [Read more...]

[Read more...]

This post was written by the team behind DataCamp, the online interactive learning platform for data science.   After being dubbed “sexiest job of the 21st Century” by Harvard Business Review, data scientists have stirred the interest of the general public. Many people are intrigued by this job, namely because the ... [Read more...]

Further to the success of the EARL2014 Conference we are delighted to announce that EARL2015 will be held in London on the 15-16th September 2015. Abstracts are invited for [Read more...]

by Joseph Rickert The igraph package has become a fundamental tool for the study of graphs and their properties, the manipulation and visualization of graphs and the statistical analysis of networks. To get an idea of just how firmly igraph has become embedded into the R package ecosystem consider that ... [Read more...]

Making a slight digression from last month’s Probable Points and Credible Intervals here is how to summarize a 2D posterior density using a highest density ellipse. This is a straight forward extension of the highest density interval to the situation where you have a two-dimensional posterior (say, represented as ... [Read more...]

Last week I came across a graphic that plots changes in the treasury yield curve from 1982 through 2012. For those unfamiliar, the yield curve shows the level of interest rates available to investors at a series of times to maturity or terms. I won't go into too much detail here, but ... [Read more...]