3276 search results for "map"

Cleaning up oversized github repositories for R and beyond

June 25, 2014
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Cleaning up oversized github repositories for R and beyond

The version control system Git is an amazing piece of software for tracking every change that you make to a project and saving its entire history. It is incredibly useful, for users of R and other programming languages, leading it shoot from 0 market share in 2005 (when it was first released) to market domination in one short decade. However, Git can cause confusion....

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Generating and visualising multivariate random numbers in R

June 24, 2014
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Generating and visualising multivariate random numbers in R

This post will present the wonderful pairs.panels function of the psych package that I discovered recently to visualise multivariate random numbers.Here is a little example with a Gaussian copula and normal and log-normal marginal distributions. I use pairs.panels to illustrate the steps along the way.I start with standardised multivariate normal random numbers:library(psych)library(MASS)Sig ...

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Performing ANOVA Test in R: Results and Interpretation

June 23, 2014
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Performing ANOVA Test in R: Results and Interpretation

When testing an hypothesis with a categorical explanatory variable and a quantitative response variable, the tool normally used in statistics is Analysis of Variances, also called ANOVA.In this post I am performing an ANOVA test using the R programming language, to a...

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Gulf Stream centre detection

June 22, 2014
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Gulf Stream centre detection

Introduction Definitions of Gulf Stream location sometimes centre on thermal signature, but it might make sense to work with dynamic height instead. This is illustrated here, using a model for , with the distance along the transect. The idea is to select , the halfway point in the function, where the slope is maximum...

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Contest: Prizes for Best R User Groups Plotting Code

June 19, 2014
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by Joseph Rickert For the past year or so we have been plotting the location of R user groups around the world using code (Download RUGS) adapted from a solution that Sandy Muspratt originally posted on Stack Overflow. In last week’s post, we made a modest improvement to our presentation by including a map of Europe. However, R users...

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Free Geometric Mophometrics – a Summary

June 18, 2014
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I have seen a few questions floating around the interwebs recently from people starting up in morphometrics and wondering what is the best software to use. I am inspired by my fellow 3D expert Dr. Peter Falkingham's blog post on free sof...

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The Ikeda’s Galaxy

June 17, 2014
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The Ikeda’s Galaxy

Chaos is the score upon which reality is written (Henry Miller) Nonlinear dynamical systems are an enormous seam of amazing images. The Ikeda Map is an example of strange attractor which represents the movement of particles under the rules of certain differential equations. I have drawn the trajectories followed by of 200 particles under the

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Who wants to learn R? Sharing DataCamp’s user stats and insights.

June 16, 2014
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Who wants to learn R? Sharing DataCamp’s user stats and insights.

When building an online education start-up for R the number one criterion to meet is the following: identify an increasing interest in learning R online. Once this box is checked, it is time to start thinking of the second most important criterion: establish a teaching approach that makes people so excited that they keep coming back to learn more,

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Text mining in R – Automatic categorization of Wikipedia articles

June 16, 2014
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Text mining in R – Automatic categorization of Wikipedia articles

Text mining is currently a live issue in data analysis. Enoromus text data resourses on the Internet made it an important component of Big Data world. The potential of information hidden in the words is the reason why I find…Read more ›

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Specifying complicated groups of time series in hts

June 14, 2014
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With the latest version of the hts package for R, it is now possible to specify rather complicated grouping structures relatively easily. All aggregation structures can be represented as hierarchies or as cross-products of hierarchies. For example, a hierarchical time series may be based on geography: country, state, region, store. Often there is also a separate product hierarchy: product...

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