6194 search results for "git"

Pearson’s chi-squared test: a simple implementation in R (test of independence)

December 17, 2014
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Pearson’s chi-squared test: a simple implementation in R (test of independence)

Hi everyone! Today I found my old statistics workbooks and start wondering what I could get out of them. Statistics can look pretty boring when using only pen and paper, since many times you’re just making a lot of repetitive calculations. However, the results of those calculations might of course be interesting. Person’s chi-squared test is a simple...

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R code coverage support via docker

December 17, 2014
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R code coverage support via docker 2014-12-17 Source In my previous post , I used a R with built-in code coverage to compute the code coverage of some packages. Today I will show you how to install and use such a R with code coverage support. I just created a public docker container that provides this patched R. If you do not...

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Preferring a preference index

December 17, 2014
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Preferring a preference index

I’ve been reading about preference indexes lately, specifically for characterising pollinator preferences for plants, so here is what I learnt. Preference is defined as using an item (e.g. plant) more than expected given the item abundance. First I like to use … Continue reading →

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New R package for electricity forecasting

December 17, 2014
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Shu Fan and I have developed a model for electricity demand forecasting that is now widely used in Australia for long-term forecasting of peak electricity demand. It has become known as the “Monash Electricity Forecasting Model”. We have decided to release an R package that implements our model so that other people can easily use it.

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More Snowdoop Coming

December 16, 2014
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More Snowdoop Coming

In spite of the banter between Yihui and me, I’m glad to hear that he may be interested in Snowdoop, as are some others.  I’m quite busy this week (finishing writing my Parallel Computation for Data Science book, and still have a lot of Fall Quarter grading to do :-) ), but you’ll definitely be … Continue reading...

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Introducing V8: An Embedded JavaScript Engine for R

December 16, 2014
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Introducing V8: An Embedded JavaScript Engine for R

JavaScript is an fantastic language for building applications. It runs on browsers, servers and databases, making it possible to design an entire web stack in a single language. The OpenCPU JavaScript client already allows for calling R functions from JavaScript (see jsfiddles and apps). With the new V8...

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Yikes…It’s Been Awile

December 16, 2014
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Apparently our last blog post was in August. Dang. Where did five months go? Blog guilt would be killing me, but I swear it was just yesterday that Mine posted. I will give a bit of review of some of … Continue reading →

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The Mandelbrot Set in R

December 16, 2014
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The Mandelbrot Set in R

IntroductionI was having a conversation with someone I know about weather forecasts the other day and it went something like this:"Yes, their forecasts are really not very good. They really need to work on improving them.""Well, yes, I think they're ok...

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Interactive 2D & 3D Plots with Plotly and ggplot2

December 16, 2014
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Interactive 2D & 3D Plots with Plotly and ggplot2

by Matt Sundquist co-founder of Plotly R, Plotly, and ggplot2 let you make, share, and collaborate on beautiful, interactive plots online. Let's see what we can do with the topographic data from Auckland's Maunga Whau Volcano that comes with R. Copy and paste this R code to make your first plot. The basic idea is: use ggplot2 code, add...

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Don’t teach built-in plotting to beginners (teach ggplot2)

December 15, 2014
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Don’t teach built-in plotting to beginners (teach ggplot2)

I have some experience teaching R programming (see, for instance, my online course). One of the atypical choices I make is to start by teaching Hadley Wickham’s ggplot2 package, rather than the built-in R plotting (see these videos). Many times that I mention this choice to others involved in statistics education, they treat it like a mistake...

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