A user of my Introductory Fisheries Analyses with R book recently asked me how to compute standard errors (SE) for the various PSD indices by using the usual equation for the SE of a proportion (square root of p times (1-p) divided by n). B... [Read more...]

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At the University of Utah, I teach the R lab that accompanies MATH 3070, “Applied Statistics I.”” None of my students are presumed to have any programming experience, and they never hesitate to remind me of that fact, especially when they are starting out. When I create assignments and pick problems, ... [Read more...]

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The R Consortium has already funded 8 projects (and 3 more just in July) proposed by the R community, and the call for proposals for yet more projects is now open. If you have an idea for a projects that would advance R or the R Community, get your submission in by ... [Read more...]

Multiple tests of significance can be employed when performing MANOVA. The most well known and widely used MANOVA test statistics are Wilk’s , Pillai, Lawley-Hotelling, and Roy’s test. Unlike ANOVA in which only one dependent variable is examined, several tests are often utilized in MANOVA due to its multidimensional ... [Read more...]

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An overview on error analysis through cross-validation, variance, bias, bootstrapping, accuracy and time dependent predictive models. [Read more...]

[For this exercise, first write down your answer, without using R. Then, check your answer using R.] Answers to the exercises are available here. Exercise 1 If M=matrix(c(1:10),nrow=5,ncol=2, dimnames=list(c('a','b','c','d','e'),c('A','B'))) What is the value of: M Exercise 2 Consider ... [Read more...]

The team here at DataCamp is thrilled to announce that we now offer free Italian (thanks to Quantide) and German (thanks to eoda) translations of our most popular course, Introduction to R. Best of all, the courses are free as a part of our open cours... [Read more...]

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The library() and require() can be used to attach and load add-on packages which are already installed. The main difference between the two function is explained in the post. [Read more...]

The time has come to release the first of our internal tools, which we use on a regular basis when developing Shiny apps for our customers. In just a few lines of code added to your project you get a helpful routing mechanism that allows to recreate a particular state ... [Read more...]

A few weeks ago we announced the first release of the tesseract package: a high quality OCR engine in R. We have now released an update with extra features. Installing Training Data As explained in the first post, the tesseract system is powered by language specific training data. By default ... [Read more...]

A new version of RcppAPT -- our interface from R to the C++ library behind the awesome apt, apt-get, apt-cache, ... commands and their cache powering Debian, Ubuntu and the like -- is now on CRAN. We changed the package to require C++11 compilation a... [Read more...]

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This post shows a simple example of creating an interactive display that allows you to navigate thousands of instagram posts with just a few lines of code using TrelliscopeJS. The example comes from a hackathon in the DARPA XDATA program earlier this year. If you missed the announcement about TrelliscopeJS, ... [Read more...]

An old riddle found on X validated asking for Monte Carlo resolution  but originally given on Project Euler: A 30×30 grid of squares contains 30² fleas, initially one flea per square. When a bell is rung, each flea jumps to an adjacent square at random. What is the expected number of unoccupied ... [Read more...]

Run SQL on S3 Data via Athena in RSanta comes early for us data scientist in the form of a brilliant new Amazon service called Athena. Athena now allows you to use standard SQL to query directly from data that lives in Amazon's Simple Storage Service (S3). One of the ... [Read more...]