956 search results for "how to import image file to R"

Customer segmentation – LifeCycle Grids with R

February 16, 2015
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Customer segmentation – LifeCycle Grids with R

I want to share a very powerful approach for customer segmentation in this post. It is based on customer’s lifecycle, specifically on frequency and recency of purchases. The idea of using these metrics comes from the RFM analysis. Recency and frequency are very important behavior metrics. We are interested in frequent and recent purchases, because frequency... Read More »

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How-to go parallel in R – basics + tips

February 16, 2015
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How-to go parallel in R – basics + tips

Today is a good day to start parallelizing your code. I've been using the parallel package since its integration with R (v. 2.14.0) and its much easier than it at first seems. In this post I'll go through the basics for implementing parallel computations in R, cover a few common pitfalls, and give tips on how to avoid them....

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Introduction to OpenCPU for R on EC2 with Python

February 15, 2015
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Introduction to OpenCPU for R on EC2 with Python

OpenCPU is (simply put) a server implementing a RESTful web API for remotely executing R functions and retrieving results. In this tutorial I am going to showcase how OpenCPU can be installed on an EC2 instance running Ubuntu 14.04. Python and … Continue reading →

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translate2R and translateSPSS2R: Implanting SPSS functionality into R

February 12, 2015
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translate2R and translateSPSS2R: Implanting SPSS functionality into R

In this blog article from October 2014, we gave a brief introduction to translate2R explaining the main reasons for as well as advantages of translate2R. Now, we want to showcase the inner workings of this migration process with a focus on the R environment and the respective R package translateSPSS2R. Furthermore, we will also show

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More on Quadratic Progarmming in R

February 10, 2015
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More on Quadratic Progarmming in R

This post is another tour of quadratic programming algorithms and applications in R. First, we look at the quadratic program that lies at the heart of support vector machine (SVM) classification. Then we'll look at a very different quadratic programming demo problem that models the energy of a circus tent. The key...

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What to expect from Strata Conference 2015? An empirical outlook.

February 9, 2015
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What to expect from Strata Conference 2015? An empirical outlook.

In one week, the 2015 edition of Strata Conference (or rather: Strata + Hadoop World) will open its doors to data scientists and big data practitioners from all over the world. What will be the most important big data technology trends for this year? As last year, I ran an analysis on the

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Paris’s history, captured in its streets

February 2, 2015
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Paris’s history, captured in its streets

The following image by Mathieu Rajerison has been doing the rounds of French media recently. It shows the streets of Paris, color-coded by their compass direction. It's been featured in an article in Telerama magazine, and even on French TV Channel LCI (skip ahead to 8:20 in the linked video. which also features an interview with Mathieu). Mathieu used...

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What does a Bayes factor feel like?

January 29, 2015
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What does a Bayes factor feel like?

A Bayes factor (BF) is a statistical index that quantifies the evidence for a hypothesis, compared to an alternative hypothesis (for introductions to Bayes factors, see here, here or here). Although the BF is a continuous measure of evidence, humans love verbal labels, categories, and benchmarks. Labels give interpretations of the objective index – and

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Why you should learn R first for data science

January 26, 2015
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Why you should learn R first for data science

Over and over, when talking with people who are starting to learn data science, there’s a frustration that comes up: I don’t know which programming language to start with.” And it’s not just programming languages, it’s also software systems like Tableau, SPSS, etc. There is an ever widening range of tools and programming languages and The post

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Comparing the contribution of NBA draft picks

January 25, 2015
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Comparing the contribution of NBA draft picks

When it comes to the NBA draft, experts tend to argue about a number of things: at which position will a player be selected? what is the best draft class ever? etc… Luckily, the wealth of data made available by the great people of http://www.basketball-reference.com/draft/ make it possible to address a number of these, and other questions. To…

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