Statistics

Statistics Blogs

The Kernel Trick in Support Vector Machines: Seeing Similarity in More Intricate Dimensions

May 24, 2016
By
The Kernel Trick in Support Vector Machines: Seeing Similarity in More Intricate Dimensions

The "kernel" is the seed or the essence at the heart or the core, and the kernel function measures distance from that center. In the following example from Wikipedia, the kernel is at the origin and the different curves illustrate alternative depiction...

Read more »

Principal Components Regression, Pt. 2: Y-Aware Methods

May 23, 2016
By
Principal Components Regression, Pt. 2: Y-Aware Methods

In our previous note, we discussed some problems that can arise when using standard principal components analysis (specifically, principal components regression) to model the relationship between independent (x) and dependent (y) variables. In this note, we present some dimensionality reduction techniques that alleviate some of those problems, in particular what we call Y-Aware Principal Components … Continue reading Principal Components Regression, Pt. 2: Y-Aware Methods

Read more »

Tip of the day: don’t be Theranosed

May 23, 2016
By

Theranos (v): to spin stories that appeal to data while not presenting any data To be Theranosed is to fall for scammers who tell stories appealing to data but do not present any actual data. This is worse than story time, in which the storyteller starts out with real data but veers off mid-stream into unsubstantiated froth, hoping you and I got carried away by the narrative flow. Theranos (n):…

Read more »

Bayes 2016

May 23, 2016
By
Bayes 2016

Earlier this week I was at the Bayes 2016 meeting, in lovely Leuven. Although I've been to Belgium quite a few times before, this was my first trip to Leuven $-$ somebody who used to work at UCL once told me that they didn't really like the place,...

Read more »

A Quick Illustration of Pre-Testing Bias

May 23, 2016
By
A Quick Illustration of Pre-Testing Bias

The statistical and econometric literature on the properties of "preliminary-test" (or "pre-test") estimation strategies is large and well established. These strategies arise when we proceed in a sequential manner when drawing inferences about paramete...

Read more »

Martin Amis on How to Write a Great Sentence

May 22, 2016
By

It's been a while since I did a piece on good writing, for students.   In an old post I said "Listen to your words; push your prose toward poetry."  That's perhaps a bit much -- you don't need to write poetry, but you do need to lis...

Read more »

BCEA 2.2-3 is out

May 22, 2016
By

I think the newest release of BCEA, our R package to standardise and post-process the output of a health economic model, is now available from CRAN $-$ in fact, the source code is also available here. The package is rather stable, so the...

Read more »

Simulating a Weibull conditional on time-to-event is greater than a given time

May 20, 2016
By
Simulating a Weibull conditional on time-to-event is greater than a given time

Recently, I had to simulate a time-to-event of subjects who have been on a study, are still ongoing at the time of a data cut, but who are still at risk of an event (e.g. progressive disease, cardiac event, death). This requires the simulation of a con...

Read more »

Hazard Functions for U.S. Expansions

May 20, 2016
By
Hazard Functions for U.S. Expansions

Glenn Rudebusch has a very nice 2016 FRBSF Letter, "Will the Economic Recovery Die of Old Age?".  He draws on perspective and results from our joint work of 25 years ago (including a paper we did with Dan Sichel -- see below), and he applies them ...

Read more »

R/Finance 2016: Applied Finance with R

May 20, 2016
By

At R/Finance 2016: Applied Finance with R.  Interesting group, with many constituencies, and interesting program, which appears below (or go to http://www.rinfinance.com/agenda/).Friday, May 20th, 201608:00 - 09:00Optional Pre-...

Read more »


Subscribe

Email:

  Subscribe