Monthly Archives: August 2013

ggplot2 meet d3

August 7, 2013
By

With great libraries, just a couple lines of code can do amazing things.  For instance, let’s limit ourselves to less than 10 lines of code and see what ggplot2 and d3 can do.  We will use gridSVG as discussed in yesterday’s post I Want ggplot2/lattice and d3 (gridSVG–The Glue) to expose ggplot2 to d3.  Thanks

Read more »

Disrupting the Traditional Analytics Ecosystem

August 7, 2013
By

This guest post is by Punit Kulkarni. Punit is the Director of Marketing at Symphony Analytics and a marketing technology enthusiast. He has helped Fortune 500 retailers and brands in building their customer loyalty programs, direct marketing and business analytics. As a trusted co-marketing partner of Revolution Analytics, Symphony Analytics is committed to developing predictive analytics solutions built upon...

Read more »

Downloading SP500 stock price data with R

August 7, 2013
By
Downloading SP500 stock price data with R

Using R, we show how to download historic stock prices for all S&P500 components from Yahoo!Finance. We visualize missing data, and process stock prices to get clean daily logarithmic returns. The data then could readily be used in financial applications like risk management or asset management.

Read more »

Trends in the Analytics Job Market

August 7, 2013
By
Trends in the Analytics Job Market

Tracking the job market for statistics, analytics, data mining and the like used to be a major undertaking. However, on November 10, 2011 the world’s largest web site for job postings, Indeed.com, released a tool that allows you to examine trends … Continue reading →

Read more »

The power, and danger, of visualizations

August 7, 2013
By
The power, and danger, of visualizations

I recently posted about visualizing the voting patterns of senators. In the post, I scraped voting data for each senator on every vote in the 113th Congress from the Senate website, and then assigned a code of 0 for a no vote on a particular issue, 1 for a yes vote, 2 for abstention, and 3 if the...

Read more »

JSM 2013 – Tuesday

August 7, 2013
By
JSM 2013 – Tuesday

The Joint Statistical Meeting in Montreal has proven to be very good.   Here are a few highlight from Tuesday’s sessions.  There is one major problem that exists and that is there are too many good sessions to attend.  During one time block I had six session that I wanted to go to.  Unfortunately, it

Read more »

Assessing the precision of classification tree model predictions

Assessing the precision of classification tree model predictions

My last post focused on the use of the ctree procedure in the R package party to build classification tree models.  These models map each record in a dataset into one of M mutually exclusive groups, which are characterized by their average response.  For responses coded as 0 or 1, this average may be regarded as an estimate of...

Read more »

Cronbach to the future

August 6, 2013
By

One fascinating thing about working in the area of psychological statistics is how hard it is to move people away from reliance on bad, inefficient or otherwise problematic methods. My own view - informed to some extent by the literature, by experience and by anecdote is that it isn't sufficient merely to establish than the standard approach is wrong....

Read more »

How to choose a new business location with R

August 6, 2013
By
How to choose a new business location with R

This guest post is by Rodolfo Vanzini. Rodolfo is senior partner at eXponential.it — an asset management consultancy based in Italy — and advises clients on investment management issues. He taught at the University of Siena and is an analytics professional. With an economist education and a financial markets expertise four years ago I thought I couldn't be of...

Read more »

JSM 2013 – Monday

August 6, 2013
By
JSM 2013 – Monday

I am currently attending the 2013 Joint Statistical Meeting in Montreal. I will try to share a few if the things that I take away each day. Last night (Monday) I attended the JSM keynote speaker with Nate Silver and it proved to be a very interesting discussion.  Silver is best known for his work

Read more »