3793 search results for "gis"

Quick and dirty notes on General Linear Mix Models

February 24, 2014
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Quick and dirty notes on General Linear Mix Models

My datasets tend to have random factors. I try to stick to general models whenever I can to avoid dealing with both random factors and complex error distributions (not always possible). I am compiling some notes here to avoid visiting … Continue reading →

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twitteR now supports database persistence

February 23, 2014
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For a long time now I've wanted to add the ability for storing data from twitteR into a RDBMS. In the past I've done things by concatenating new results onto old results which simply becomes unwieldy. I know that many people have doctored up their own ...

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Toronto Data Science Group – A Survey of Data Visualization Techniques and Practice

February 23, 2014
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Recently I spoke at the Toronto Data Science group. The folks at Mozilla were kind enough to record it and put it on Air, so here it is for your viewing pleasure (and critique):Overall it was quite well received. Aside from the usual omg does my voice ...

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Convex Hull of Polygon using Boost.Geometry

February 23, 2014
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Convex Hull of Polygon using Boost.Geometry

Rcpp can be used to convert basic R data types to and from Boost.Geometry models. In this example we take a matrix of 2d-points and convert it into a Boost.Geometry polygon. We then compute the convex hull of this polygon using a Boost.Geometry function boost::geometry::convex_hull. The convex hull is then converted back to an R matrix. The conversions to and...

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Call for papeRs in the near future

February 21, 2014
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Call for papeRs in the near future

I am really happy to share some great news with all R users about some upcoming conferences in the near future. The calls for papers are still active for all three below events that I plan to visit, I hope I could meet more and more useRs there!The closest event in time will be at Bucharest, Romania on the...

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Control R from Excel

February 20, 2014
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Control R from Excel

Here is a simple script modified from univie.ac.at that you can just run in R. Follow the instructions in the ensuing dilaogue boxes after running the script. This RExcel interface will help you if you tend to work with people whose knowledge of R is ...

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Merge by City and State in R

February 20, 2014
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Often, you'll need to merge two data frames based on multiple variables. For this example, we'll use the common case of needing to merge by city and state.First, you need to read in both your data sets:# import city coordinate data:coords <- read.cs...

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Function to Simplify Loading and Installing Packages

February 20, 2014
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One of the more tedious parts of working with R is maintaining my R library. To make my R scripts reproducible and sharable, I will install packages if they are not available. For example, the top of my R scripts tend to look something like this: if(!require(devtools) | !require(ggplot2) | !require(psych) | !require(lme4) | !require(benchmark)) { install.packages(c('devtools','ggplot2','psych','lme4','benchmark')) } This has worked fine for...

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R in Insurance 2014 Conference Poster

February 20, 2014
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R in Insurance 2014 Conference Poster

Here is the poster for the 2nd R in Insurance conference on Monday 14 July 2014 at Cass Business School in London:R in Insurance 2014 conference poster. Download PDF versionImportant dead lines to keep in mind:Abstract submissions: 28 March 2014Early b...

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R: Fun with surf3D function

February 19, 2014
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R: Fun with surf3D function

There is one package that I've been longing. A package that will give me the power to manipulate and do any 3D stuffs in R. I tried persp and wireframe, but I find them difficult to use especially on complicated mathematical functions, like doing param...

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