iptools is a set of tools for working with IP addresses. Not just work, but work fast. It’s backed by Rcpp and now uses the AsioHeaders package by Dirk Eddelbuettel, which means it no longer needs to link against the monolithic Boost libraries and works on Windows! What can ... [Read more...]

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This is a remake of a chart at reddit 6 months ago. I had an idea back then, but did not work it out and now the discussion is closed. The data comes from wikipedia, dimdat and NYT. The graph was created with R, here is the source code. [Read more...]

This is a remake of a chart at reddit 6 months ago. I had an idea back then, but did not work it out and now the discussion is closed. The data comes from wikipedia, dimdat and NYT. The graph was created with R, here is the source code. [Read more...]

It's been only around 2 months since the idea of community-driven R conferences was born, when Steph Locke first talked publicly about this cool conception, but I am pretty sure we will be able to attend at least one or two satRdays in 2016 -- as the project received many and very ... [Read more...]

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[social4i size=”large” align=”float-right”] tl;dr: $10 new year deal at Udemy – until the Jan 11 2016. For the next 9 days (until [Read more...]

This post will introduce you to bayesian regression in R, see the reference list at the end of the post for further information concerning this very broad topic. Bayesian regression Bayesian statistics turn around the Bayes theorem, which in a regression context is the following: $$ P(theta|Data) propto P(... [Read more...]

Making it easier to use C++ in R has been a really nice and rewarding side effect of the work on Rcpp. One really good idea came from something Jay Emerson, Michael Kane and had I kicked about for way too long: shipping Boost headers for easier use by R ... [Read more...]

This note shows how to use the stringr package to clean a list of full names that need to be turned into unique identifiers, i.e. something that can be assigned as row names to a data frame. Example Let’s start by getting a list of real names by ... [Read more...]

In 2013, EPA published final national recommended water quality criteria for the protection of aquatic life from the toxic effects of ammonia in freshwater.http://www.epa.gov/wqc/aquatic-life-criteria-ammoniaThese criteria are a function of water temperature and pH, so that the criteria concentration value changes with changing pH and temperature.  ... [Read more...]

In 2013, EPA published final national recommended water quality criteria for the protection of aquatic life from the toxic effects of ammonia in freshwater.http://www.epa.gov/wqc/aquatic-life-criteria-ammoniaThese criteria are a function of water ... [Read more...]

by Joseph Rickert There are number of R packages devoted to sophisticated applications of Markov chains. These include msm and SemiMarkov for fitting multistate models to panel data, mstate for survival analysis applications, TPmsm for estimating transition probabilities for 3-state progressive disease models, heemod for applying Markov models to health ... [Read more...]

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pacman::p_load(data.table, microbenchmark ) train train_mat f1 f2 microbenchmark(f1(),f2(),times=10) [Read more...]

##### Removing constant features cat("n## Removing the constants features.n") for (f in names(train)) { if (length(unique(train[[f]])) == 1) { cat(f, "is constant in train. We delete it.n") train[[f]] [Read more...]

I find this code super useful because R’s implementation of xgboost (and to my knowledge Python’s) otherwise lacks support for a grid search: [Read more...]

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By Paulin Shek Both R and distributed programming rank highly on my list of “good things”, so imagine my delight when two new packages, ddR (https://github.com/vertica/ddR) and multidplyr (https://github.com/hadley/multidplyr), used for distributed programming in R were released in November last … Continue reading → [Read more...]

In the exercises below we cover the basics of reading delimited data. Before proceeding, first read section 7.1 of An Introduction to R, and the help pages for the read.table function. Answers to the exercises are available here. For each exercise we provide a data set that can be accessed ... [Read more...]