Here's another rule of three, this one in statistics. The post Another rule of three, this one in statistics appeared first on Decision Science News. [Read more...]

Welcome to the fifth post in the recklessly rambling R rants series, or R4 for short. The third post showed an easy way to follow R development by monitoring (curated) changes on the NEWS file for the development version r-devel. As a concrete example, I mentioned that it has shown ... [Read more...]

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Today is the one year anniversary of the janeaustenr package’s appearance on CRAN, its cranniversary, if you will. I think it’s time for more Jane Austen here on my blog. via GIPHY I saw this paper by Matthew Jockers and Gabi Kirilloff a number of months ago and ... [Read more...]

When writing a blog, sooner or later, one measures and consequently tries to improve some kind of success metric. In my case; I have been tracking user behavior (visitors, bounce rate, pageviews, …) for slightly over a year with Google Analytics. Whi... [Read more...]

In this continuation of “Hybrid content-based and collaborative filtering recommendations with {ordinal} logistic regression (1): Feature engineering” I will describe the application of the {ordinal} clm() function to test a new, hybrid content-based, collaborative filtering approach to recommender engines by fitting a class of ordinal logistic (aka ordered logit) models to ... [Read more...]

I will use {ordinal} clm() (and other cool R packages such as {text2vec} as well) here to develop a hybrid content-based, collaborative filtering, and (obivously) model-based approach to solve the recommendation problem on the MovieLens 100K dataset in R. All R code used in this project can be obtained ... [Read more...]

The latest draft of my book is available. This will be my last pre-publication update, as I’m in the process …Continue reading → [Read more...]

Following on from when we announced the availability of our community workshops, we’ve got three in the next three months that folks can attend. May 19th – Data science project in a day We’ll be in Kiev, Ukraine, doing a The post Community workshops appeared first on Locke Data. ... [Read more...]

Introduction Last week I found a lot of materials I used as teaching assistant. Among those materials I found some class notes from Arne Henningsen, the author of micEcon R package. I'll use that package and some others to show some concepts from Microeconomic Theory. Packages installation: #install.packages(c("... [Read more...]

Introduction Last week I found a lot of materials I used as teaching assistant. Among those materials I found some class notes from Arne Henningsen, the author of micEcon R package. I'll use that package and some others to show some concepts from Microeconomic Theory. Packages installation: #install.packages(c("... [Read more...]

by [Ben Marwick](https://twitter.com/benmarwick/), Associate Professor of Archaeology, University of Washington and Senior Research Scientist, University of Wollongong The [Society of American Archaeology (SAA)](http://www.saa.org/) is one of the largest professional organisations for archaeologists in the world, and just concluded its annual meeting in ... [Read more...]

Network problems are everywhere. We can easily find instances in logistics, telecom, project mangement, among others. In order to attack these problems using linear programming we need to go beyond assign and transportation problems that we saw in part I. Our goal here is to expand the problems we can ... [Read more...]

The story so far Last week I looked at a few related methods of investigating causality with observational data, where the treatment is expected to be received by observational units (people or firms)… in a way that is structurally related to ... [Read more...]

Original Age Bias Plot Campana et al. (1995) introduced the “age bias plot” to visually assess potential differences in paired age estimates (e.g., between two structures such as scales and otoliths, between two readers, or between one ... [Read more...]

A new RcppArmadillo version 0.7.800.2.0 is now on CRAN. Armadillo is a powerful and expressive C++ template library for linear algebra aiming towards a good balance between speed and ease of use with a syntax deliberately close to a Matlab. RcppArma... [Read more...]

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Note: What other facts about Jeff Leek do you “know”? Please feel free to click the edit button above and submit a pull request on Github, or tweet with the hashtag #jeffleekfacts. I have not written blog posts for quite a while. It is not because I don’t have ... [Read more...]

Choosing R packages for mixed effects modelling based on the car you drive There are many roads you can take to fit a mixed effects model (sometimes termed hierarchical models) in R. There are numerous packages that each deploy different engines to fi... [Read more...]