# 2890 search results for "map"

## Spatial clipping and aggregation in R

January 10, 2014
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A common task in GIS is comparing the spatial extent of one layer with another. Say you have a load of points, some of which overlay a polygon layer. You are only interested in the points that intersect with the points. What do you do? Also, how can you aggregated-up the values contained in the points to correspond with the...

## Instrumental Variables Simulation

January 9, 2014
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Instrumental Variables Instrumental variables are an incredibly powerful for dealing with unobserved heterogenity within the context of regression but the language used to define them is mind bending. Typically, you hear something along the lines of “an instrumental variable is a variable that is correlated with x but uncorrelated with...

## How to use vectorization to streamline simulations

January 6, 2014
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$How to use vectorization to streamline simulations$

While grading some homework it became apparent that many of the idioms of R are not widely known and aren’t …Continue reading »

## Pivoting Data in R Excel-style

January 2, 2014
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(This article is referring to an initial proof-of-concept version of r-big-pivot) I have to admit that I very much enjoy pivoting through data using Excel. Its pivoting tool is great for getting a quick insight into a data set’s structure … Continue reading → The post Pivoting Data in R Excel-style appeared first on joy...

## Fun with R and graphs on the dawn of 2014

December 31, 2013
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There is some secret message hidden in this graph Let’s decode it Resulting in Wishing everyone a Happy New Year 2014, cheers!

## Using R as a Computer Algebra System with Ryacas

December 31, 2013
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R is used to perform statistical analysis and doesn't focus on symbolic maths. But it is sometimes useful to let the computer derive a function for you (and have the analytic expression of said derivative), but maybe you don't want to leave your comfy R shell. It is possible to turn R into a full-fledged computer...

## Decluttering ordination plots part 4: orditkplot()

December 31, 2013
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Earlier in this series I looked at the ordilabel() and then the orditorp() functions, and most recently the ordipointlabel() function in the vegan package as means to improve labelling in ordination plots. In this, the fourth and final post in the series I take a look at orditkplot(). If you’ve created ordination diagrams before or...

## dcemriS4 0.51

December 30, 2013
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The R package dcemriS4 provides routines for the quantitative analysis of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI), along with quantification of diffusion-weighted MRI (DWI) and quantitative T2 maps from CPMG sequences.  The ...

## K-means Clustering 86 Single Malt Scotch Whiskies

December 30, 2013
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by Luba Gloukhov The first time I had an Islay single malt, my mind was blown. In my first foray into the world of whiskies, I took the plunge into the smokiest, peatiest beast of them all — Laphroig. That same night, dreams of owning a smoker were replaced by the desire to roam the landscape of smoky single...

## Hadoop for R’s Data scientist

December 29, 2013
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I don’t exactly know where to start. But, after a real pleasant discussion with one of my ex colleague, it seems that there are many thongs around Hadoop ecosystem and R for analyst that should be said by a data scientist, means that, someone who don’t know much more about big data architecture, but who should know the essentials...