May 2014

A quick look at FX realized vol

May 31, 2014 | 0 Comments

Much has been said about the decline in volatility. At the moment I am very active in FX spot trading and as a generalization do better the more vol there is. I wanted to see how things stood on the crosses I am most active in, namely EUR/USD, GBP/... [Read more...]

RcppGSL 0.2.1 and 0.2.2

May 31, 2014 | 0 Comments

A few days ago, version 0.2.1 of RcppGSL---our interface package between R and the GNU GSL using our Rcpp package for seamless R and C++ integration---appeared on CRAN making it the first release in some time. And it turned that this version tickle... [Read more...]

Retrospective: Writing an O’Reilly Book

May 31, 2014 | 0 Comments

A number of people have asked me about the amount of time and effort involved in writing a book as I just completed one for O'Reilly (published in April and is available on Amazon).   The process at O'Reilly is unique in that a book is written and initially formatted on ... [Read more...]

Cohort analysis with R – “layer-cake graph”

May 31, 2014 | 0 Comments

Cohort analysis is one of the most powerful and demanded technique available to marketers for assessing long-term trends in customer retention and calculating life-time value. If you studied custora’s university, you could be interested by amazing “layer-cake graph” they propose for Cohort analysis. Custora says: “The distinctive “layer-cake graph” ...
[Read more...]

Mindoro Digital Elevation Map Updated

May 30, 2014 | 0 Comments

Almost 2 years ago, I made a post on creating digital elevation map using R. For that post, I used the basic R plotting function to create the map. Recently, I started learning to use ggplot2 package for visualizing data. Today, I created the same map ... [Read more...]

Tools for Online Teaching

May 30, 2014 | 0 Comments

Last semester (Fall 2014), I organized and taught an interdisciplinary, collaborative class titled Probability for Scientists. Getting 4 separate teachers on the same page was a challenge, but as scientists we're used to communicating over email, and ... [Read more...]

A new gitbook – learnR

May 30, 2014 | 0 Comments

Gitbook is rather a relatively new concept on the web. It provides a user-friendly framework for authors to write and produce online books with beautiful illustrations and responsive interactions. It allows authors to write in Markdown syntax, which is very easy to learn and use, so that they can focus ... [Read more...]

Trimming the Fat from glm() Models in R

May 30, 2014 | 0 Comments

One of the attractive aspects of logistic regression models (and linear models in general) is their compactness: the size of the model grows in the number of coefficients, not in the size of the training data. With R, though, glm models are not so concise; we noticed this to our ... [Read more...]

hipsteR: Learn what you missed in R as an early adopter

May 30, 2014 | 0 Comments

If you learned R in its early days (say, the early 2000's or even the late 1990's) you may still be using some — ahem — old-fashioned ways to accomplish some tasks better served by newer functions and packages. To help those of us who have may missed some of R's more ... [Read more...]

Visualizing asylum statistics

May 30, 2014 | 0 Comments

Note: of potential interest to R users for the dynamic Google chart generated via googleVis in R and discussed towards the end of the post. Here you can go directly to the graph. An emergency refugee center, opened in September … Continue reading → [Read more...]

Step-by-Step Guide to Setting Up an R-Hadoop System

May 30, 2014 | 0 Comments

by Yanchang Zhao RDataMining.com Following my first R-Hadoop system setup guide written in Sept 2013, I have further tested setting up a Hadoop system for running R code, as well as using HBase. I have tested it both on a … Continue reading → [Read more...]

RGolf: rolling window

May 30, 2014 | 0 Comments

I have learned a lot from my last RGolf post. Therefore today I have another problem from practice.You have a data set on values of contracts signed by ten salesmen. It has three columns: person id (p), contract value (v) and time (t).Here is the code ... [Read more...]

gist: dfToJSON

May 30, 2014 | 0 Comments

I’ve been using a lot of javascript charting and visualisation libraries recently (e.g. D3, highcharts) and found that it is quite painful to get my data into the JSON structure required by each library. Since I’m doing most of the data manipulation in R anyway it makes ... [Read more...]

Your Life in Weeks

May 29, 2014 | 0 Comments

This week, I discovered a picture on http://waitbutwhy.com/, which represent a (so-called) typical human life, in weeks, I found that interesting. But the first problem is that I don’t understand the limit, below: 90 years, that’s not the average life length. That’s not what you should ... [Read more...]

5th MilanoR meeting postponed to June 4

May 29, 2014 | 0 Comments

Dear R users and enthusiasts, MilanoR staff announces the MilanoR meeting scheduled on Friday May 30 is postponed, due to a strike. The 5th MilanoR meeting will be on Wednesday 4 June, at 6 pm. The meeting will take place at: Fiori … Continue reading → [Read more...]
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