3793 search results for "gis"

How divided is the Senate?

July 29, 2013
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How divided is the Senate?

I very seldom pay attention to politics directly, because politics have always seemed a bit circular and cyclical to me. Most of the political news that I take in ends up worming its way into the news sources that I do consume, like the excellent longform.org. Even given my limited intake of political news, one trend that I...

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Estimate Age from First Name

July 29, 2013
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Estimate Age from First Name

Today I read a cute post from Flowing Data on the most trendy names in US history. What caught my attention was a link posted in the article to the source data, which happens to be yearly lists of baby … Continue reading →

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Classification of the Hyper-Spectral and LiDAR Imagery using R (mostly). Part 1: Result Evaluation

July 28, 2013
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Classification of the Hyper-Spectral and LiDAR Imagery using R (mostly). Part 1: Result Evaluation

Introduction There was the EEEI Data Fusion Contest this spring. This year they wanted people to elaborate about hyper-spectral (142-bands imagery) and LiDAR data. The resolution of the data-set was about 5 m.  There were 2 nominations: best classification and  the best scientific paper.  I work with high-resolution imagery quite often, but classification is a very rear task for me...

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Science link fest for the week of the 27th

July 27, 2013
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Science link fest for the week of the 27th

Hello Paleoposse! This week I bring you Egyptians and iron meteorites, Neil deGrasse Tyson as the Carl Sagan of our generation and a mild rant about poor quality science reporting. I’m off to enjoy my 30th birthday. Hope you all have an awesome weekend! Solid science: Here’s a story that’s near and dear to my

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Network visualization – part 2: Gephi

July 26, 2013
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Network visualization – part 2: Gephi

In the second part of my “how to quickly visualize networks directly from R” series, I’ll discuss how to use R and the “rgexf” package to create network plots in Gephi. Gephi is a great network visualization tool that allows … Continue reading →

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shinyPsychometric: simulating how experimental choices affect results uncertainty

July 25, 2013
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shinyPsychometric: simulating how experimental choices affect results uncertainty

In the R community, Shiny is trending a lot. Shiny is an R package for developing interactive web applications. I wanted to give it a try, and ended up with an app to simulate the impact of data collection choices on the outcome reliability of a curve fitting process. I wrote the code behind it

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A Note About proj4 in R

July 24, 2013
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It's been a long time since I had to transform some coordinates 'manually'. I mean I had a list of coordinates that I needed to project. There are some nice proprietary tools for it, but who needs them when the opensource is everywhere?Proj4 is an ...

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R Credit Scoring – WoE & Information Value in woe Package

July 23, 2013
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R Credit Scoring – WoE & Information Value in woe Package

In credit scoring, Information Value (IV) is frequently used to compare predictive power among variables. When developing new scorecards using logistic regression, variables are often binned and recoded using WoE concept. Package riv will help you to a...

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Using survival models for marketing attribution

July 23, 2013
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by Andrie de Vries Prior to joining Revolution Analytics in March this year, I spent several years in the field of market research and survey analytics. During this period, I spent a few months consulting to a digital marketing agency based in London. My role was to help build their capability in building customer surveys and integrating these into...

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A Beginner’s Look at Julia

July 23, 2013
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Over the past month or so, I’ve been playing with a new scientific programming language called ‘Julia‘, which aims to be a high-level language with performance approaching that of C. With that goal in mind, Julia could be a replacement for the ‘multi-language’ problem of needing to move between R, Python, MATLAB, C, Fortran, Scala, A Beginner’s Look...

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