2642 search results for "map"

Grid Search for Free Parameters with Parallel Computing

June 1, 2013
By
Grid Search for Free Parameters with Parallel Computing

In my previous post (http://statcompute.wordpress.com/2013/05/25/test-drive-of-parallel-computing-with-r) on 05/25/2013, I’ve demonstrated the power of parallel computing with various R packages. However, in the real world, it is not straight-forward to utilize these powerful tools in our day-by-day computing tasks without carefully formulate the problem. In the example below, I am going to show how to use the

Read more »

Flotsam 12: early June linkathon

June 1, 2013
By

A list of interesting R/Stats quickies to keep the mind distracted: A long draft Advanced Data Analysis from an Elementary Point of View by Cosma Shalizi, in which he uses R to drive home the message. Not your average elementary point of view. Good notes by Frank Davenport on starting using R with data from

Read more »

The arteries of the world, in Tweets

May 31, 2013
By
The arteries of the world, in Tweets

What happens when you plot billions of geotagged Tweets on a map? You can see the arteries of the world. Here's Europe: According to creator Miguel Rios (Engineering Manager, Data Visualization at Twitter), the dots on this chart represent every geotagged Tweet since 2009. The color represents number of tweets in the region, and the intensity shows where people...

Read more »

accurate ABC: comments by Oliver Ratman [guest post]

May 31, 2013
By
accurate ABC: comments by Oliver Ratman [guest post]

Here are comments by Olli following my post: I think we found a general means to obtain accurate ABC in the sense of matching the posterior mean or MAP exactly, and then minimising the KL distance between the true posterior and its ABC approximation subject to this condition. The construction works on an auxiliary probability

Read more »

Couch, apis and all that

May 30, 2013
By

It is getting easier to get data directly into R from the web. Often R packages that retrieve data from the web return useful R data structures like a data.frame or plot. This is a good thing of course to make things user friendly. However, what if you want to drill down into the data that's returned from a query...

Read more »

Shiny talk by Joe Cheng

May 29, 2013
By
Shiny talk by Joe Cheng

Shiny is a framework work for creating web applications with R. Joe Cheng of RStudio, Inc. presented on Shiny last evening in Zillow's offices 30 stories up in the former WaMu Center. Luckily, the talk was interesting enough to compete with the view ...

Read more »

Convert IP addresses to geolocation, latitude and longitude etc etc

May 29, 2013
By
Convert IP addresses to geolocation, latitude and longitude etc etc

Whoa! Now this is cool. It turns out there is a database at freegeoip.net which you can query for the location of a particular IP address. And as it has a neat little API for batches of IPs, you can … Continue reading →

Read more »

Analysis of Cable Morning Trade Strategy

May 29, 2013
By
Analysis of Cable Morning Trade Strategy

A couple of years ago I implemented an automated trading algorithm for a strategy called the “Cable Morning Trade”. The basis of the strategy is the range of GBPUSD during the interval 05:00 to 09:00 London time. Two buy stop orders are placed 5 points above the highest high for this period; two sell stop

Read more »

R/Finance 2013 Review

May 28, 2013
By

It's been one week since the 5th Annual R/Finance conference, and I finally feel sufficiently recovered enough to share my thoughts. The conference is a two-day whirlwind of applied quantitative finance, fantastic networking, and general geekery.The comments below are based on my personal experience.  If I don't comment on a seminar or presentation, it doesn't mean I...

Read more »

The heat is on…. or is it? Trend Analysis of Toronto Climate Data

May 27, 2013
By
The heat is on…. or is it? Trend Analysis of Toronto Climate Data

The following is a guest post from Joel Harrrison, PhD, consulting Aquatic Scientist.For a luddite like me, this is a big step – posting something on the inter-web.  I’m not on Facebook.  I don’t know what Twitter is.  Hell, I don’t even own a smartphone.  But, I’ve been a devoted follower of Myles’ blog for some time,...

Read more »