2719 search results for "GIS"

A gallery view for Craigslist

May 1, 2012
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A gallery view for Craigslist

As much as I love Craigslist, I sometimes find the interface a bit limited. My biggest wish? That there was an option for showing the search results as an image gallery, like eBay has. This could prove quite useful for browsing things like antiques,...

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Mining for relations between nominal variables

May 1, 2012
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Mining for relations between nominal variables

The task today was to find what variables had significant relations with an important grouping variable in the big dataset I’ve been working with lately.  The grouping variable has 3 levels, and represents different behaviours of interest.  At first I … Continue reading →

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NSF BIGDATA webinar

May 1, 2012
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If you're doing any kind of big data analysis - genomics, transcriptomics, proteomics, bioinformatics - then unless you've been on vacation the last few weeks you've no doubt heard about the NSF/NIH BIGDATA  Initiative (here's the NSF solicitation...

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French Global Factors

April 30, 2012
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French Global Factors

I have said it already in multiple posts, but Kenneth French’s data library is one of the most generous and powerful contributions to the financial community.  To build on Systematic Investor’s series on factors, I thought I should run some ba...

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Incompetence borne of excessive cleverness

April 29, 2012
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I have just got back from the 24 hour Data Science Global Hackathon; I was an on-site participant at Hub Westminster in London (thanks to Carlos and his team for doing such a great job looking after us all {around 50 turned up from the 100 who registered; the percentage was similar in other cities

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Guess who wins: apply() versus for loops in R

April 28, 2012
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Guess who wins: apply() versus for loops in R

Yesterday I tried to do some data processing on my really big data set in MS Excel. Wow, did it not like handling all those data!! Every time I tried to click on a different ribbon, the screen didn’t even … Continue reading →

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R Workshop: Reproducible Research using Sweave for Beginers

April 27, 2012
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R Workshop: Reproducible Research using Sweave for Beginers

Monday, April 30, 2012  14h-16h. Stewart Biology Rm w6/12 (Montreal) guRu: Denis Haine (Université de Montréal) Topics Reproducible research was first coined by Pr. Jon Claerbout, professor of geophysics at Stanford University, to describe that the results from researches can be replicated by other scientists by making available data, procedures, materials and the computational environment

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How to download complete XML records from PubMed and extract data

April 27, 2012
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How to download complete XML records from PubMed and extract data

Yesterday I wrote an article that looked at the top 20 Cognitive Behavior Therapy journals with the most publications; today I will explain how I did it with R.

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Real Time Structural Break

April 27, 2012
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Real Time Structural Break

Yesterday as I played with bfast I kept thinking “Yes, but this is all in hindsight.  How can I potentially use this in a system?”  Fortunately, one of the fine authors very generously commented on my post Structural Breaks (Bull or Bear?...

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Measuring user retention using cohort analysis with R

April 27, 2012
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Measuring user retention using cohort analysis with R

Cohort analysis is super important if you want to know if your service is in fact a leaky bucket despite nice growth of absolute numbers. There’s a good write up on that subject “Cohorts, Retention, Churn, ARPU” by Matt Johnson. So how to do it using R and how to visualize it. Inspired by examples

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