Blog Archives

Generalized Linear Models understanding the link function

October 15, 2018
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Generalized Linear Models understanding the link function

Generalized Linear Models: understanding the link function Generalized Linear Models (‘GLMs’) are one of the most useful modern statistical tools, because they can be applied to many different types of data. Count, binary ‘yes/no’, and waiting...

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Beginner Intermediate and Advanced R courses February 2019

September 28, 2018
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Beginner, Intermediate and Advanced R courses February 2019 This is an announcement of our next set of R courses. There are 4 separate courses taught over 5th-8th February 2019. You can register with the Centre for Applications in Resource Management...

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Survey your audience and visualise the results with R and Google forms

July 4, 2018
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Survey your audience and visualise the results with R and Google forms

Survey your audience and visualise the results with R and Google forms I wanted to make my presentation on dataviz at the UQ School of Bioinformatics more interactive. A quiz is a good way to engage your audience. Given I was giving a talk about R datavisuals I thought it would be fun to visualise the quiz results using R live with the audience. To...

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A brief guide to data visuals in R in 2018

July 3, 2018
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A brief guide to data visuals in R in 2018

Data visuals 2018 Supplementary notes for CJ Brown’s talks on dataviz in 2018 for Griffith University’s honours students and the UQ Winterschool in Bioinformatics. These notes run through some of the principles I present and also show R code for generating data visuals. If you want to take the dataviz quiz first, then click here. We will look at the results later using R. If you are interested...

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How do I interpret the AIC

April 12, 2018
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How do I interpret the AIC

How do I interpret the AIC? My student asked today how to interpret the AIC (Akaike’s Information Criteria) statistic for model selection. We ended up bashing out some R code to demonstrate how to calculate the AIC for a simple GLM (general linear model). I always think if you can understand the derivation of a statistic, it is much easier to remember how to...

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Should I learn sf or sp for spatial R programming

March 22, 2018
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Should I learn sf or sp for spatial R programming? I recently received an email about some of the short-courses on my webpage. The correspondant was asked whether my course on Maps and GIS in R was still relevant, it being written in 2014. The R env...

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How do I calculate the R squared metric for a Bayesian model

January 28, 2018
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How do I calculate the R squared metric for a Bayesian model? A good friend I met on a field trip long ago, Dominique Roche, recently emailed me to ask about evaluation of Bayesian models. He has been delving into generalized linear models, using Ba...

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General Linear Models The Basics

January 18, 2018
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General Linear Models The Basics

General Linear Models: The Basics General linear models are one of the most widely used statistical tool in the biological sciences. This may be because they are so flexible and they can address many different problems, that they provide useful output...

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Checking residual distributions for non-normal GLMs

October 5, 2017
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Checking residual distributions for non-normal GLMs

Checking residual distributions for non-normal GLMs Quantile-quantile plots If you are fitting a linear regression with Gaussian (normally distributed) errors, then one of the standard checks is to make sure the residuals are approximately normally d...

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Stay motivated with R programming by knowing your emotions

September 17, 2017
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Stay motivated with R programming by knowing your emotions We don’t usually think of programming as an ‘emotional’ experience. It is all code and computer logic and if using R, probably statistics. But recognising the emotions you face when pro...

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