R-bloggers

So an article/website is doing the rounds describing some country-level observational analysis of the relationship between hydroxychloroquine usage in the early stages of Covid-19 and deaths from that disease per million population. It purports to show... [Read more...]

ROC for Decision Trees – where did the data come from? By Jerry Tuttle       In doing decision tree classification problems, I have often graphed the ROC (Receiver Operating Characteristic) curve. The True Positive Rate (TPR) is on the y-axis, and the False Positive Rate (FPR) is on the x-axis. True Positive ... [Read more...]

(This is part 2 of n “quick hit” posts, each walking through some approaches to speeding up components of an iterative operation. Go here for part 1). Thanks to the aforementioned previous post, we now have a super fast way of reading individual text files containing HTTP headers from HEAD requests into ... [Read more...]

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Another maintenance RVowpalWabbit package update brought us to version 0.0.15 earlier today. We attempted to fix one compilation error on Solaris, and addressed a few SAN/UBSAN issues with the gcc build. As noted before, there is a newer package rvw ... [Read more...]

Outline R Markdown provides the chunk option ref.label to reuse chunks. In this post, I'll show potential problems with this approach and present an easy and safe alternative. If you don't bother with the detailed Explanation, feel free to jump right to the Summary section. Explanation Consider you have ... [Read more...]

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(This is part 1 of n posts using this same data; n will likely be 2-3, and the posts are more around optimization than anything else.) I recently had to analyze HTTP response headers (generated by a HEAD request) from around 74,000 sites (each response stored in a text file). They look ... [Read more...]

This week in the High School Swimming State-Off Tournament we have the third seeded Sunshine State, Florida (3) taking on the sixth seeded Illinois (6) aka the Prairie State. library(SwimmeR) library(dplyr) library(stringr) library(purrr) library(flextable) Florida Results Florida has a nice results repository, with Hy-Tek real-time results. This ... [Read more...]

A fresh major release of the nanotime package for working with nanosecond timestamps is hitting CRAN mirrors right now. nanotime relies on the RcppCCTZ package for (efficient) high(er) resolution time parsing and formatting up to nanosecond resolutio... [Read more...]

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The magick package is a really powerful package for image processing in R. The official vignette is a great place to start learning how to use the package. I’ve been playing around with using magick for manipulating GIFs and found … Continue reading → [Read more...]

I think most people start using R with scripts initially. Scripts are great for modular computational tasks, but for generating informative reports, Rmarkdown is a must. Rmd makes it possible to use a YAML header to specify certain parameters right at the beginning of the document. Built-in YAML parameters make ... [Read more...]

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A new minor release 0.2.8 of RcppCCTZ is now on CRAN. RcppCCTZ uses Rcpp to bring CCTZ to R. CCTZ is a C++ library for translating between absolute and civil times using the rules of a time zone. In fact, it is two libraries. One for dealing with civ... [Read more...]

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RStudio is proud to announce the general availability of RStudio Cloud, its cloud-based platform for doing, teaching, and learning data science using only a browser. This general release incorporates feedback from thousands of users, based on more than 3.5 million hours of compute time. What is RStudio Cloud? RStudio Cloud is ... [Read more...]

In this post we'll talk about what the Central Limit Theorem is, why it's important, and how we can see it in action, using R. [Read more...]