296 search results for "animation"

Schelling’s Neighborhood Model

April 30, 2011
By
Schelling’s Neighborhood Model

The New York Times has created a beautiful visualization of the Census Bureau's 2005-2009 American Community Survey data. The distribution of racial and ethnic groups in New York City is particularly fascinating:Chinatown appears in red toward the sou...

Read more »

Produce Authentic Math Formulas in R Graphics

April 30, 2011
By
Produce Authentic Math Formulas in R Graphics

I remember a few weeks ago, there was a challenge in the R-help list to make the prime symbol in R graphics. In LaTeX, we simply write $X'$ or $X^\prime$. R has a rough support for math expressions (see demo(plotmath)) and they are certainly unsatisfactory for LaTeX users. In fact we can write native LaTeX

Read more »

A Tiny Model of Evolution

April 25, 2011
By
A Tiny Model of Evolution

I've always wanted to write a(n overly) simple model of evolution. The assumptions are minimalistic: only one species, for which each individual's genotype is represented as a one-dimensional real number, e.g. 7.4. Now, the fun stuff: I define a fu...

Read more »

Of Height and Speed in Tennis, or Fuzziness and Techiness in College

April 24, 2011
By
Of Height and Speed in Tennis, or Fuzziness and Techiness in College

I thought of this after reading this post and perhaps also this one, one the Cheap Talk blog. Here's the puzzle: in general, being tall does not make you slow; but among professional tennis players, the tall athletes do tend to be relativel...

Read more »

Visualizing iPhone location tracking with R and Google Maps

April 22, 2011
By
Visualizing iPhone location tracking with R and Google Maps

Visualize location logs created by the iPhone using R and Google Maps.

Read more »

Time horizon in forecasting, and rules of thumb

April 7, 2011
By
Time horizon in forecasting, and rules of thumb

I recently received an email about forecasting and rules of thumb. "Dans la profession se transmet une règle empirique qui voudrait que l'on prenne un historique du double de l'horizon de prévision : 20 ans de données pour une prévision

Read more »

Alpha shapes with R and lattice

Alpha shapes with R and lattice

What are the alpha shapes?: “The concept of alpha shapes formalizes the intuitive notion of “shape” for spatial point set data, which occurs frequently in the computational sciences. An alpha shape is a concrete geometric object that is uniquely defined for a particular point set. Alpha shapes are generalizations of the convex hull. Given a

Read more »

No simulation is complete without a gif

March 24, 2011
By
No simulation is complete without a gif

I promise this is my last post on the now week and a half old π pay! Building on the last post, I figured I could show how convergence actually works in the estimation algorithm. If you’ll recall, we plotted … Continue reading →

Read more »

Visualizing Growth of a Retail Chain

March 15, 2011
By
Visualizing Growth of a Retail Chain

I am a regular reader of the FlowingData blog by Nathan Yau. It is an excellent reference for anyone interested in statistical visualization of data. One of his posts that caught my attention was a visualization of the growth of Walmart in the US. Given my research interests in retail, it was a fascinating insight

Read more »

In case you missed it: January Roundup

March 8, 2011
By

Catching up on roundups today. February roundup will follow soon, but in the meantime enjoy this trip down memory lane - DS. In case you missed them, here are some articles from January of particular interest to R users. Revolution Analytics is now offering annual sponsorship grants for local R user groups worldwide. Issue 2 of the R Journal...

Read more »