Turning your dataset into a package is very useful for reproducable research. This tutorial is for you, even if you’ve never created a package in r. Why would you turn your dataset into a package? very easy to share easy to load (library(name) is easier then load("path/...

Nonnegative matrix factorization (NMF) is a popular tool in many applications, such as image and text recognition. If you’ve ever wanted to learn a little bit about NMF, you can do so right here, in this blog post, which will summarize the (slightly) longer presentation here. The R package ...

In the assessment of education it is very common to use Item Response Theory in order to produce measures of ability for the students that applied an standardised test. Moreover, if you want to gain comparability between applications you should know th...

Introduction Here is a sneak preview of my latest package cricket package yorkr in R. My earlier package ‘cricketr’ (see Introducing cricketr: An R package for analyzing performances of cricketers) was based on data from ESPN Cricinfo Statsguru. My current package ‘yorkr’ is based on data from Cricsheet. The data ...

I have recently restarted working with Stan and unfortunately ran into the problem that my (hierarchical) Bayesian models often produced divergent transitions. And when this happens, the warning basically only suggests to increase adapt_delta: Warning messages: 1: There were X divergent transitions after warmup. Increasing adapt_delta above 0.8 may help. 2: ...