4933 search results for "git"

A speed test comparison of plyr, data.table, and dplyr

September 23, 2013
By
A speed test comparison of plyr, data.table, and dplyr

Guest post by Jake Russ For a recent project I needed to make a simple sum calculation on a rather large data frame (0.8 GB, 4+ million rows, and ~80,000 groups). As an avid user of Hadley Wickham’s packages, my first …Read more »

Read more »

Citations for using Stan?

September 23, 2013
By
Citations for using Stan?

Bob writes: If you have papers that have used Stan, we’d love to hear about it. We finally got some submissions, so we’re going to start a list on the web site for 2.0 in earnest. You can either mail them to the list, to me directly, or just update the issue (at least until The post Citations...

Read more »

Building models over rolling time periods

September 23, 2013
By

Often I have some idea for a trading system that is of the form “does some particular aspect of the last n periods of data have any predictive use for subsequent periods.” I generally like to work with nice units of time, such as 4 weeks or 6 months, rather than 30 or 126 days. It probably doesn’t...

Read more »

Going to Plot Some Proportions? Why not Flog ’em First?

September 23, 2013
By
Going to Plot Some Proportions? Why not Flog ’em First?

Fractions and proportions can be difficult to plot nicely for a number of reasons: If the proportions are based on small counts (e.g., two of his three computing devices were Apple products) then the calculated proportions will only take on a number of discrete values. Depending on what you have measured there might be many proportions close to the...

Read more »

analyze the home mortgage disclosure act (hmda) microdata with r and monetdb

September 23, 2013
By

back in 1975, congress had it up to here with discriminatory lending practices and decided to require financial organizations originating home mortgages to report some basic operational statistics publicly.  the home mortgage disclosure act mandat...

Read more »

A few gotchas with R date-time classes

September 21, 2013
By

Date and time handling is essential to many modelling and analysis exercises, in R and other languages used for scientific computing. Over the past few months I tackled the mapping of date-time concepts between R and the .NET framework as part of the w...

Read more »

Calling R functions through AJAX using opencpu.js

September 21, 2013
By
Calling R functions through AJAX using opencpu.js

The opencpu.js library builds on jQuery to call R functions through AJAX, straight from the browser. This makes it easy to embed R based computation or graphics in apps. Moreover, asynchronous requests (which are native in Javascript) make parallelization a natural part of the application. This post introduces some of...

Read more »

Calling R functions through AJAX using opencpu.js

September 21, 2013
By
Calling R functions through AJAX using opencpu.js

The opencpu.js library builds on jQuery to call R functions through AJAX, straight from the browser. This makes it easy to embed R based computation or graphics in apps. Moreover, asynchronous requests (which are native in Javascript) make parallelization a natural part of the application. This post introduces some of...

Read more »

Genetics to Finance – Amazed By Open Source d3 and r

September 19, 2013
By
Genetics to Finance – Amazed By Open Source d3 and r

Open source amazes me by the speed of distribution and the power of iteration.  Take for example the very  fine combination of R and d3 provided here at http://www.biostat.wisc.edu/~kbroman/D3/.  The correlation matrix with scatterplot i...

Read more »

Video: Google Analytics with R

September 19, 2013
By
WA_WITH_R

This post shares the video from the talk presented in September 2013 by Johann de Boer on accessing Google Analytics using R at Melbourne R Users. In this presentation Johann will share his experience in creating his first open-source R … Continue reading →

Read more »