Create a waterfall plot in SAS

April 20, 2015
By
Create a waterfall plot in SAS

In clinical trials, a waterfall plot is often used to indicate how patients in the study responded to treatment. In oncology trials, the response variable might be the percent change in the size of a tumor from the individual's baseline value at the start of the trial. The percent change […] The post Create a waterfall plot in SAS appeared first on The DO Loop.

Read more »

Paper: ISOTYPE Visualization – Working Memory, Performance, and Engagement with Pictographs

April 20, 2015
By
Paper: ISOTYPE Visualization – Working Memory, Performance, and Engagement with Pictographs

Unit charts are not common in visualization, and they are often considered a bad idea. The same is true for using shapes other than rectangles. Neither is based on much actual research, however. In a new paper, we look at the specific example of ISOTYPE-style charts – and find them to be quite effective. I have written about ISOTYPE … Continue reading Paper: ISOTYPE Visualization – Working Memory, Performance, and Engagement with Pictographs

Read more »

Reading fixed width formats in the Hadleyverse

April 19, 2015
By
Reading fixed width formats in the Hadleyverse

This is an update to a previous post on reading fixed width formats in R. A new addition to the Hadleyverse is the package readr, which includes a function read_fwf to read fixed width format files. I’ll compare the LaF approach to the readr approach using the same dataset as before. The variable wt is […]

Read more »

PK analysis: Theoph again

April 19, 2015
By
PK analysis: Theoph again

This week I wanted to repeat the Theoph PK analysis of two weeks ago in Stan. It also suddenly dawned on me. For a non-linear model in classical statistics we think it normal to provide good initializations. In contrast, for those MCMC samples I rememb...

Read more »

Go to PredictWise for forecast probabilities of events in the news

April 19, 2015
By
Go to PredictWise for forecast probabilities of events in the news

I like it. Clear, transparent, no mumbo jumbo about their secret sauce. But . . . what’s with the hyper-precision: C’mon. “27.4%”? Who are you kidding?? (See here for explication of this point.) The post Go to PredictWise ...

Read more »

Diederik Stapel in the news, again

April 19, 2015
By

Bikes . . . have “become the most common mode of transportation for criminals.” OK, that’s just ethnic profiling of Dutch people. I think they’re just gonna put the whole country on lockdown. The post Diederik Stapel in the news, again...

Read more »

Neyman: Distinguishing tests of statistical hypotheses and tests of significance might have been a lapse of someone’s pen

April 18, 2015
By
Neyman: Distinguishing tests of statistical hypotheses and tests of significance might have been a lapse of someone’s pen

“Tests of Statistical Hypotheses and Their Use in Studies of Natural Phenomena” by Jerzy Neyman ABSTRACT. Contrary to ideas suggested by the title of the conference at which the present paper was presented, the author is not aware of a conceptual difference between a “test of a statistical hypothesis” and a “test of significance” and uses […]

Read more »

How do data and experiments fit into a scientific research program?

April 18, 2015
By

I was talking with someone today about various “dead on arrival” research programs we’ve been discussing here for the past few years: I’m talking about topics such beauty and sex ratios of children, or ovulation and voting, or ESP—all of which possibly represent real phenomena and could possibly be studied in a productive way, just […] The post How do data and experiments fit into a scientific research program? appeared…

Read more »

The Non-parametric Bootstrap as a Bayesian Model

April 17, 2015
By
The Non-parametric Bootstrap as a Bayesian Model

The non-parametric bootstrap was my first love. I was lost in a muddy swamp of zs, ts and ps when I first saw her. Conceptually beautiful, simple to implement, easy to understand (I thought back then, at least). And when she whispered in my ear, “I...

Read more »

It’s a Batsman’s World (Cup)

April 17, 2015
By
It’s a Batsman’s World (Cup)

The 2015 Cricket World Cup rewrote the record books in dramatic fashion. Amidst the usual insanity that surrounds this event, there were some amazingly good - and bad - performances. Batting-wise, some of the previous records were smashed int...

Read more »

Grades of evidence – A cheat sheet

April 17, 2015
By

There are at least three traditions in statistics which work with a kind of likelihood ratios (LRs): the “Bayes factor camp”, the “AIC camp”, and the “likehood camp”. In my experience, unfortunately most people do no...

Read more »

Gigerenzer on logical rationality vs. ecological rationality

April 17, 2015
By

I sent my post about the political implication of behavioral economics, embodied cognition, etc., to Gerd Gigerenzer, who commented as follows: The “half-empty” versus “half-full” explanation of the differences between Kahneman and us misses the essential point: the difference is about the nature of the glass of rationality, not the level of the water. For […] The post Gigerenzer on logical rationality vs. ecological rationality appeared first on Statistical Modeling,…

Read more »

Stata goes Bayesian

April 17, 2015
By

The other day, my colleague Gareth pointed out a very interesting piece of news. The new version of Stata is just out. Now, I'm not a super-Stata user (although I think it's a good package), but the interesting news is that they have now developed a sp...

Read more »

The many faces of the placebo response

April 17, 2015
By
The many faces of the placebo response

This week, a study was published that claimed that the placebo response is mediated by genetics. Though I need to dig a little deeper and figure out exactly what this article is saying, I do think we need to take a step back and remember what can const...

Read more »

Guidelines for reporting confidence intervals

April 17, 2015
By

I'm working on a manuscript on confidence intervals, and I thought I'd share a draft section on the reporting of confidence intervals. The paper has several demonstrations of how CIs may, or may not, offer quality inferences, and how they can differ ma...

Read more »

My Paper With Al Gol

April 16, 2015
By
My Paper With Al Gol

My apologies for the broken link to my paper co-authored with Al Gol that was listed in the "April Reading" post on 1 April.This has now been fixed.© 2015, David E. Giles

Read more »

A Lot moRe Than Fifty Shades of Gray

April 16, 2015
By

R has 108 shades of grey with an 'e', and 116 shades of gray with an 'a'. Fully 34% of named colors are gray/grey of some kind. So when can we expect R, the movie? # Blog appendix > temp = colors() > length(temp) #657 [1] 657 > > temp2 ...

Read more »

Perhaps the most contextless email I’ve ever received

April 16, 2015
By

Date: February 3, 2015 at 12:55:59 PM EST Subject: Sample Stats Question From: ** Hello, I hope all is well and trust that you are having a great day so far. I hate to bother you but I have a stats question that I need help with: How can you tell which group has the […] The post Perhaps the most contextless email I’ve ever received appeared first on Statistical…

Read more »

Statistics journals network

April 16, 2015
By
Statistics journals network

Xian blogged recently on the incoming RSS read paper: Statistical Modelling of Citation Exchange Between Statistics Journals, by Cristiano Varin, Manuela Cattelan and David Firth. Following the last JRSS B read paper by one of us! The data that are used in the paper (and can be downloaded here) are quite fascinating for us, academics fascinated by academic rankings, […]

Read more »

Statistics journals network

April 16, 2015
By
Statistics journals network

Xian blogged recently on the incoming RSS read paper: Statistical Modelling of Citation Exchange Between Statistics Journals, by Cristiano Varin, Manuela Cattelan and David Firth. Following the last JRSS B read paper by one of us! The data that are used in the paper (and can be downloaded here) are quite fascinating for us, academics fascinated by academic rankings, […]

Read more »

A. Spanos: Jerzy Neyman and his Enduring Legacy

April 16, 2015
By
A. Spanos: Jerzy Neyman and his Enduring Legacy

A Statistical Model as a Chance Mechanism Aris Spanos  Today is the birthday of Jerzy Neyman (April 16, 1894 – August 5, 1981). Neyman was a Polish/American statistician[i] who spent most of his professional career at the University of California, Berkeley. Neyman is best known in statistics for his pioneering contributions in framing the Neyman-Pearson (N-P) […]

Read more »

Python and R: Basic Sampling Problem

April 16, 2015
By

In this post, I would like to share a simple problem about sampling analysis. And I will demonstrate how to solve this using Python and R. The first two problems are originally from Sampling: Design and Analysis book by Sharon Lohr.ProblemsLet $N=6$ an...

Read more »

Recommending Recommender Systems When Preferences Are Not Driven By Simple Features

April 15, 2015
By
Recommending Recommender Systems When Preferences Are Not Driven By Simple Features

Why does lifting out a slice make the pizza appear more appealing?We can begin our discussion with the ultimate feature bundle - pizza toppings. Technically, a menu would only need to list all the toppings and allow the customers to build their own piz...

Read more »


Subscribe

Email:

  Subscribe