How public relations and the media are distorting science

June 24, 2015
By

Throughout history, engineers, medical doctors and other applied scientists have helped convert  basic science discoveries into products, public goods and policy that have greatly improved our quality of life. With rare exceptions, it has taken years if not decades to establish these discoveries. And even the exceptions stand on the shoulders of incremental contributions. The researchers that

Read more »

When the counterintuitive becomes the norm, arguments get twisted out of shape

June 24, 2015
By

I was bothered by a recent post on the sister blog. The post was by political scientist David Fortunato and it was called, Would “concealed carry” have stopped Dylann Roof’s church shooting spree?. What bugged me in particular was this sentence: On its face, the claim that increasing the number of gun carriers would reduce […] The post When the counterintuitive becomes the norm, arguments get twisted out of shape…

Read more »

The sensitivity of Newton’s method to an initial guess

June 24, 2015
By
The sensitivity of Newton’s method to an initial guess

In my article about finding an initial guess for root-finding algorithms, I stated that Newton's root-finding method "might not converge or might converge to a root that is far away from the root that you wanted to find." A reader wanted more information about that statement. I have previously shown […] The post The sensitivity of Newton's method to an initial guess appeared first on The DO Loop.

Read more »

Mathematical Statistics Lesson of the Day – Ancillary Statistics

Mathematical Statistics Lesson of the Day – Ancillary Statistics

The set-up for today’s post mirrors my earlier Statistics Lessons of the Day on sufficient statistics and complete statistics. Suppose that you collected data in order to estimate a parameter .  Let be the probability density function (PDF) or probability mass function (PMF) for . Let be a statistics based on . If the distribution of does NOT […]

Read more »

Mathematical Statistics Lesson of the Day – Ancillary Statistics

Mathematical Statistics Lesson of the Day – Ancillary Statistics

The set-up for today’s post mirrors my earlier Statistics Lessons of the Day on sufficient statistics and complete statistics. Suppose that you collected data in order to estimate a parameter .  Let be the probability density function (PDF) or probability mass function (PMF) for . Let be a statistics based on . If the distribution of does NOT […]

Read more »

IJF best paper awards

June 23, 2015
By
IJF best paper awards

Today at the International Symposium on Forecasting, I announced the awards for the best paper published in the International Journal of Forecasting in the period 2012–2013. We make an award every two years to the best paper(s) published in the journal. There is always about 18 months delay after the publication period to allow time for […]

Read more »

Network analysis with igraph

June 23, 2015
By
Network analysis with igraph

Suddenly, I had to learn network analysis. Two weeks ago I started with a book by Christakis and Fowler, then a book by Kolaczyk and Csárdi, now here I am in a “how to” analyse network data using R moment. This is much like learning-by-doing knowledge, so may be useful for newcomers, although at this […]

Read more »

Stan

June 23, 2015
By
Stan

Logo design by Michael Betancourt and Stephanie Mannheim. P.S. Some commenters suggested the top of the S above is too large, but I wonder if that’s just because I’ve posted the logo in a large format. On the screen it would typically be...

Read more »

A question about race based stratification

June 23, 2015
By
A question about race based stratification

Can Candan writes: I have scraped horse racing data from a web site in Turkey and would like to try some models for predicting the finishing positions of future races, what models would you suggest for that? There is one recent paper on the subject that seems promising, which claims to change the SMO algorithm […] The post A question about race based stratification appeared first on Statistical Modeling, Causal…

Read more »

arXiv frenzy

June 23, 2015
By
arXiv frenzy

In the few past days, there has been so many arXiv postings of interest—presumably the NIPS submission effect!—that I cannot hope to cover them in the coming weeks! Hopefully, some will still come out on the ‘Og in a near future: arXiv:1506.06629: Scalable Approximations of Marginal Posteriors in Variable Selection by Willem van den Boom, […]

Read more »

Next Kölner R User Meeting: Friday, 26 June 2015

June 23, 2015
By
Next Kölner R User Meeting: Friday, 26 June 2015

The next Cologne R user group meeting is scheduled for this Friday, 6 June 2015 and we have an exciting agenda with two talks followed by networking drinks. Data Science at the Commandline (Kirill Pomogajko)An Introduction to RStan and the Stan Modelli...

Read more »

Network analysis with igraph

June 23, 2015
By
Network analysis with igraph

Suddenly, I had to learn network analysis. Two weeks ago I started with a book by Christakis and Fowler, then a book by Kolaczyk and Csárdi, now here I am in a “how to” analyze network data using R moment. This is much like learning-by-doing knowl...

Read more »

Network analysis with igraph

June 23, 2015
By
Network analysis with igraph

Suddenly, I had to learn network analysis. Two weeks ago I started with a book by Christakis and Fowler, then a book by Kolaczyk and Csárdi, now here I am in a "how to" analyze network data using R moment. This is much like learning-by-doing...

Read more »

Network analysis with igraph

June 23, 2015
By
Network analysis with igraph

Suddenly, I had to learn network analysis. Two weeks ago I started with a book by Christakis and Fowler, then a book by Kolaczyk and Csárdi, now here I am in a “how to” analyze network data using R moment. This is much like learning-by-doing knowl...

Read more »

Network analysis with igraph

June 23, 2015
By
Network analysis with igraph

Suddenly, I had to learn network analysis. Two weeks ago I started with a book by Christakis and Fowler, then a book by Kolaczyk and Csárdi, now here I am in a “how to” analyze network data using R moment. This is much like learning-by-doing knowl...

Read more »

Network analysis with igraph

June 23, 2015
By
Network analysis with igraph

Suddenly, I had to learn network analysis. Two weeks ago I started with a book by Christakis and Fowler, then a book by Kolaczyk and Csárdi, now here I am in a “how to” analyze network data using R moment. This is much like learning-by-doing knowl...

Read more »

Network analysis with igraph

June 23, 2015
By
Network analysis with igraph

Suddenly, I had to learn network analysis. Two weeks ago I started with a book by Christakis and Fowler, then a book by Kolaczyk and Csárdi, now here I am in a “how to” analyze network data using R moment. This is much like learning-by-doing knowl...

Read more »

Randomized Hobbit

June 22, 2015
By
Randomized Hobbit

@wrathematics pointed me to his ngram R package for constructing and simulating from n-grams from text. I’d recently grabbed the text of the hobbit, and so I applied it to that text, with amusing results. Here’s the code I used to grab the text. Then calculate the ngrams with n=2. Simulate some number of words […]

Read more »

Randomized Hobbit

June 22, 2015
By
Randomized Hobbit

@wrathematics pointed me to his ngram R package for constructing and simulating from n-grams from text. I’d recently grabbed the text of the hobbit, and so I applied it to that text, with amusing results. Here’s the code I used to grab the text. Then calculate the ngrams with n=2. Simulate some number of words […]

Read more »

Looking for Preference in All the Wrong Places: Neuroscience Suggests Choice Model Misspecification

June 22, 2015
By
Looking for Preference in All the Wrong Places: Neuroscience Suggests Choice Model Misspecification

At its core, choice modeling is a utility estimating machine. Everything has a value reflected in the price that we are willing to pay in order to obtain it. Here are a collection of Smart Watches from a search of Google Shopping. You are free to click...

Read more »

"Readers’ Forum" Page

June 22, 2015
By
"Readers’ Forum" Page

I've added a new page to this blog - it's titled "Readers' Forum". You'll see the tab for it in the bar just above the top post on the page you're reading now.Some explanation is in order.What?The Readers' Forum is intended to be a "clearing house" for...

Read more »

Why does designing a simple A/B test seem so complicated?

June 22, 2015
By
Why does designing a simple A/B test seem so complicated?

Why does planning something as simple as an A/B test always end up feeling so complicated? An A/B test is a very simple controlled experiment where one group is subject to a new treatment (often group “B”) and the other group (often group “A”) is considered a control group. The classic example is attempting to … Continue reading Why does designing a simple A/B test seem so complicated? →

Read more »

Job advert

June 22, 2015
By
Job advert

This is an interesting post just advertised at Imperial College London by Marta.Department of Epidemiology and BiostatisticsSchool of Public HealthResearch Associate in BiostatisticsSalary: £33,410 to £42,380 per annumDuration: 3 years fixe...

Read more »


Subscribe

Email:

  Subscribe