4368 search results for "git"

Poor man’s integration – a simulated visualization approach

April 29, 2013
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Poor man’s integration – a simulated visualization approach

Every once in a while I encounter a problem that requires the use of calculus. This can be quite bothersome since my brain has refused over the years to retain any useful information related to calculus. Most of my formal training in the dark arts was completed in high school and has not been covered

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d3 <- R with rCharts and slidify

April 29, 2013
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I believe that the NY Times interactive feature 512 Paths to the White House is one of the best visualizations of all time.  It is even better when we have details on the process of creating this marvel.   Although the graphic is not suited for other data sources (please tell me if this is not...

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Stats in the Court Room Hands on Tutorial

April 29, 2013
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I got intrigued by the numbers presented in this news article talking about the re-trial in the Amanda Knox case. The defendants, accused and initially convicted of murder, were acquitted in the appeal's instance when the judge ruled that the forensic evidence was insufficiently conclusive. The appeals judge ignored the forensic scientist's advice to retest a DNA sample,...

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How to change the alpha value of colours in R

April 29, 2013
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How to change the alpha value of colours in R

Often I like to reduce the alpha value (level of transparency) of colours to identify patterns of over-plotting when displaying lots of data points with R. So, here is a tiny function that allows me to add an alpha value to a given vector of colours, e.g. a RColorBrewer palette, using col2rgb and rgb, which has...

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The Financial Crisis on Tape Part II

April 26, 2013
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The Financial Crisis on Tape Part II

EDIT: I am aware of some browsers failing to load the github code below. I will try to improve this as soon as possible. Until then it may work better on www.joesdatadiner.com than at http://www.r-bloggers.com/. Finally all the code is availa...

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Using plyr and doMC for quick and easy apply-family functions

April 26, 2013
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Using plyr and doMC for quick and easy apply-family functions

A few weeks back I dedicated a short amount of time to actually read what plyr (Wickham, 2011) is about and I was surprised. The whole idea behind plyr is very simple: expand the apply() family to do things easy. plyr has...

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Learning to code in R

April 25, 2013
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Learning to code in R

It used to be that the one of the first decisions to make when learning to program was between compiled (e.g. C or FORTRAN) and interpreted (e.g. Python) languages. In my opinion these days one would have to be a masochist to learn with a compiled language: the extra compilation time and obscure errors are

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FasteR! HigheR! StrongeR! – A Guide to Speeding Up R Code for Busy People

April 25, 2013
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FasteR! HigheR! StrongeR! – A Guide to Speeding Up R Code for Busy People

This is an overview of tools for speeding up your R code that I wrote for the Davis R Users’ Group. First, Ask “Why?” It’s customary to quote Donald Knuth at this point, but instead I’ll quote my twitter buddy Ted Hart to illustrate a point: I’m just going to say it.I like for loops in #Rstats,...

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3D Model Using the rgl Package

April 25, 2013
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3D Model Using the rgl Package

A while back, I had a unique opportunity to work with some very talented interns for the summer while I was working at Allstate insurance. Without giving away details of the project that Allstate may prefer to keep secret, let's just say that we had ac...

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Interacting, on demand, with 2012 best cities data and plotting different graphs —- Experiments with ggplot2 on shiny server

April 25, 2013
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Interacting, on demand, with 2012 best cities data and plotting different graphs —- Experiments with ggplot2 on shiny server

Data from slides on Bloomberg businessweek's site: http://images.businessweek.com/slideshows/2012-09-26/americas-50-best-citiesIn this post, I show how one can interact with a dataset and generate graphs on the fly (technically, I've predetermined...

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