# Categorically Variable

Only search Categorically Variable.

## PLOS Subject Keywords: Gathering Data

I’m putting together a couple of articles on Collaborative Filtering and Association Rules. Naturally, the first step is finding suitable data for illustrative purposes.

## Garmin ANT on Ubuntu

I finally got tired of booting up Windows to download data from my Garmin 910XT. I tried to get my old Ubuntu 15.04 system to recognise my ANT stick but failed. Now that I have a stable Ubuntu 16.04 system the time seems ripe.

## Sportsbook Betting (Part 2): Bookmakers' Odds

In the first instalment of this series we gained an understanding of the various types of odds used in Sportsbook betting and the link between those odds and implied probabilities. We noted that the implied probabilities for all possible outcomes in an event may sum to more than 100%. At first sight these seems a bit odd. It certainly appears to violate the basic principles of statistics. However, this anomaly is the mechanism by which bookmakers assure their profits. A similar principle applies in a casino.

## Animated Mortality

I’m working on a project in which I need to systematically parse a number of RSS and Atom feeds from within R. I was somewhat surprised to find that no package currently exists on CRAN to handle this task. So this presented the opportunity for a bit of DIY.

You can find the fruits of my morning’s labour here.

## Web Scraping and "invalid multibyte string"

A couple of my collaborators have had trouble using read_html() from the xml2 package to access this Wikipedia page.

## John Green: The Nerd's Guide to Learning Everything Online

99% of my learning in the last decade has happened online, so this resonates with me.

## Sportsbook Betting (Part 1): Odds

This series of articles was written as support material for Statistics exercises in a course that I’m teaching for iXperience. In the series I’ll be using illustrative examples for wagering on a variety of Sportsbook events including Horse Racing, Rugby and Tennis. The same principles can be applied across essentially all betting markets.

## Arthur Benjamin: Teach statistics before calculus!

Arthur Benjamin thinks that the end goal of teaching Mathematics at school should be Statistics rather than Calculus. He has a point: in terms of understanding things in the real world, Statistics is definitely more powerful. These ideas are quite compatible with those of Conrad Wolfram, who thinks that we should be using computers more extensively in Mathematics education.

## Conrad Wolfram: Teaching kids real math with computers

Conrad Wolfram gives a thought provoking talk on a different way to teach Mathematics in schools.

## Escalating Life Expectancy

I’ve added mortality data to the lifespan package. A result that immediately emerges from these data is that average life expectancy is steadily climbing.