Which functions in plyr do people use?
This is the question that Hadley Wickham recently set out to discovering by asking frequent R and plyr users how they use it in an online survey. Once a decent number of [Read more...]
plyr
Montreal R User Group meetup Nov. 14th
After a bit of a summer lull, the Montreal R User Group is meeting up again! We’re trying out a new venue this time. Notman House is the home of the web in Montreal. They hold hackathons and other tech user group meetups, and they are all around great ... [Read more...]
Congressional ideology by state
In a recent post, I illustrated how to add a background geom to your ggplot. While that code worked, and the plot looked fine, it was pointed out to me that I was missing an important aspect of plot layering with ggplot2. Namely, it is not, as I previ... [Read more...]
Adding a background to your ggplot
I really enjoy using the DW-NOMINATE data for examples, as I do here. Sometimes it’s useful to indicate regions in the background of a plot — perhaps two-dimensional regions of interest, perhaps one-dimensional periods in time. It’s... [Read more...]
The distribution of ideology in the U.S. House (with plyr)
This Gist has a couple of things going on, I’ll just list them:
It downloads the entire history of U.S. House DW-NOMINATE scores from voteview.com
It evaluates aggregate statistics, with members grouped by party and congress, with easy weighted ... [Read more...]
Log odds ratios and an indicator matrix from categorical data
A long title, but there are a couple of handy things in this Gist. The first, and more obscure, is the conversion of a data.frame of categorical variables into a matrix of dummy/binary/indicator variables, one for each category of each original variab... [Read more...]
Transforming subsets of data in R with by, ddply and data.table
Transforming data sets with R is usually the starting point of my data analysis work. Here is a scenario which comes up from time to time: transform subsets of a data frame, based on context given in one or a combination of columns.As an example I use ...
Montreal R workshop: Plyr, reshape and other data manipulation goodies
March 12, 2012 14h-16h N4/17 Stewart Biology Building, McGill University Étienne Low-Decarie, McGill University This workshop is organized by the BGSA and is free of charge (!), but space is limited. Register early to ensure your spot! From Étienne: Ever want to split your data according to factors, apply a function on ...
Say it in R with "by", "apply" and friends
Iris versicolor (Source: Wikipedia)R is a language, as Luis Apiolaza pointed out in his recent post. This is absolutely true, and learning a programming language is not much different from learning a foreign language. It takes time and a lot of pr...
Weecology can has new mammal dataset
So the Weecology folks have published a large dataset on mammal communities in a data paper in Ecology. I know nothing about mammal communities, but that doesn't mean one can't play with the data...Their dataset consists of five csv files: &...
A quick primer on split-apply-combine problems
I’ve just answered my hundred billionth question on Stack Overflow that goes something like I want to calculate some statistic for lots of different groups. Although these questions provide a steady stream of easy points, its such a common and basic data analysis concept that I thought it would ... [Read more...]
I Work For The Internet !
UPDATE: code and figure updated at 1150 am CST.The site I WORK FOR THE INTERNET is collecting pictures and first names (last name initials only) to show collective support against SOPA (the Stop Online Piracy Act). Please stop by their site and a...
Parallelization using plyr: loading objects and packages into worker nodes
I really love the plyr package. Apart from having a progress bar and plyr handeling a lot of the overhead, a very interesting feature is being able to run plyr in parallel mode. Essentially, setting .parallel = TRUE runs any… See more › [Read more...]
Your Data is Never the Right Shape
One of the recurring frustrations in data analytics is that your data is never in the right shape. Worst case: you are not aware of this and every step you attempt is more expensive, less reliable and less informative than you would want. Best case: you notice this and have ... [Read more...]
plyr’s idata.frame VS. data.frame
I had seen the function idata.frame in plyr before, but not really tested it. Here are a few comparisons of operations on normal data frames and immutable data frames. Immutable data frames don't work with the doBy package, but do work with aggregate i...
One-way ANOVAs in R – including post-hocs/t-tests and graphs
In this post, I go over the basics of running an ANOVA using R. The dataset I’ll be examining comes from this website, and I’ve discussed it previously (starting here and then here). I’ve not seen many examples where someone runs through the … Continue reading → [Read more...]
Charting the Defeat of AV using R (and some ggplot2 and merge operations on top)
In this post, I’ll be graphing some results from a recent referendum held here in the UK and combining it with the results of a set of local elections that were held at the same time. I’ll give some examples of graphing stuff using ggplot2 and will also ... [Read more...]
Data Aggregation in R: plyr, sqldf and data.table
I’ve also previously put up a couple of posts about aggregating data in R. In this post, I’m going to be trying some other alternative methods for aggregating the dataset. Before I begin, I’d like to thank Matthew Dowle for highlighting these to me. It’s a ... [Read more...]
Article about plyr published in JSS, and the citation was added to the new plyr (version 1.5)
The plyr package (by Hadley Wickham) is one of the few R packages for which I can claim to have used for all of my statistical projects. So whenever a new version of plyr comes out I tend to be excited about it (as was when version 1.2 came out with ... [Read more...]
Troubling news for the teaching of evolution
A recent survey reported in Science ("Defeating Creationism in the Courtroom, but not in the Classroom"), suggests that high school teachers are not teaching evolution to the fullest extent, say, that grammar is being taught in the English c...
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