On of the most frequently asked questions about the BayesFactor package is how to do multiple comparisons; that is, given that some effect exists across factor levels or means, how can we test whether two specific effects are unequal. In the next two posts, I'll explain how this can be ... [Read more...]

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While skimming Professor Hadley Wickham’s Advanced R I got to thinking about nature of the square-bracket or extract operator in R. It turns out “[,]” is a bit more irregular than I remembered. The subsetting section of Advanced R has a very good discussion on the subsetting and selection operators ... [Read more...]

Almost any PC today is multicore.  Dual-core is standard, quad-core is easily attainable for the home, and larger systems, say 16-core, are easily within reach of even smaller research projects. In addition, large multicore systems can be “rented” on Amazon EC2 and so on. The most popular way to program ... [Read more...]

LDA for mortals I’ve been intrigued by LDA topic models for a few weeks now. I actually built one before I really knew what I was doing. That kind of frightens and excites me. On one hand, LDA provides rich output which is easy for the humanist researcher to ... [Read more...]

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Harvard University is offering a free 5-week on-line course on Statistics and R for the Life Sciences on the edX platform. The course promises you will learn the basics of statistical inference and the basics of using R scripts to conduct reproducible research. You'll just need a backround in basic ... [Read more...]

The way some classes (e.g. NumericVector have been implemented in various R/C++ versions gives us automatic coercion. For example passing an integer vector to a C++ function that has a NumericVector as an argument will coerce the integer vector into a ... [Read more...]

About a month ago, I announced the release of the htmltable package. In the meantime a lot has happened. Years have changed and the –presumably formidable– htmlTable package has been released on CRAN. So much for my beloved package name. Since I need a new one, let's find something shorter, ... [Read more...]

[This article was first published on Rmetrics blogs, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here) Want to share your [Read more...]

[This article was first published on Rmetrics blogs, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here) Want to share your [Read more...]

[This article was first published on Rmetrics blogs, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here) Want to share your [Read more...]

When I was looking for Data Science certificate programs back in 2013, there were only a few available and most had only graduated one or two cohorts. Even worse, I could not find a single review for any of them. So, this is my review of the University of Washington Data ... [Read more...]

I recently came across this question on Cross Validated, and I thought it offered a great opportunity to use R and ggplot2 to explore, in depth, the assumptions underlying the k-means algorithm. The question, and my response, follow. K-means is a widely used method in cluster analysis. In my understanding, ... [Read more...]

Long time no see ...Today I pushed the cpumemlog script to GitHub https://github.com/gregorgorjanc/cpumemlog. Read more about this useful utility at the GitHub site. [Read more...]

Plotly’s interactive 3D graphs let you make graphs from (click the links for tutorials): our web app, Excel, Google Docs, Python, MATLAB, and R. Click any image below to go to the full-screen interactive version. Also, news for users with on-premise needs. Plotly On-Premise can be hosted on a ... [Read more...]

Someone asked recently how lambda.r deals with NAs in type constraints. Type constraints are optional decorations on a function that …Continue reading → [Read more...]