The harm done by tests of significance

March 25, 2013
By

After seeing this recent discussion, Ezra Hauer sent along an article of his from the journal Accident Analysis and Prevention, describing three examples from accident research in which null hypothesis significance testing led researchers astray. Hauer writes: The problem is clear. Researchers obtain real data which, while noisy, time and again point in a certain [...]

Read more »

Ordinal data with JAGS

March 25, 2013
By

Last week is had a look at the standard R routines for estimating models for ordinal data. This week, I want to have a look at JAGS for examining the same data. To be honest, most of it is taking an example (inhaler) and removing code. To my surpr...

Read more »

Podcast #6: Data Analysis MOOC Post-mortem

March 25, 2013
By

Jeff and I talk about Jeff’s recently completed MOOC on Data Analysis.

Read more »

Free magazine, negative heights, and statistical methods

March 25, 2013
By

There is a magazine that you should know about. It’s called Significance (link). With that name, it's hardly surprising that it has statistical content. Mathematical equations are kept to a minimum, and typically set off in boxes. I highly recommend it. The reason why I’m writing about it today is that for 2013, you can read it for free via their iPhone or Android app (information here). The magazine is…

Read more »

How to plot a discontinuous function

March 25, 2013
By
How to plot a discontinuous function

It is easy to use the SGPLOT procedure in SAS to plot the graph of a well-behaved continuous function: just create a data set of the (x,y) values on some domain and use the SERIES statement to connect the points. However, to plot the graph of a discontinuous function correctly [...]

Read more »

Submit a talk for the first R in Insurance conference

March 25, 2013
By
Submit a talk for the first R in Insurance conference

The registration for the first R in Insurance is open and there is still time to submit a talk / lightning talk. The conference will take place at Cass Business School in London on Monday, 15 July 2013. This is the Monday following the useR! 2013 ...

Read more »

Does It Make Sense to Segment Using Individual Estimates from a Hierarchical Bayes Choice Model?

March 25, 2013
By
Does It Make Sense to Segment Using Individual Estimates from a Hierarchical Bayes Choice Model?

I raise this question because we see calls for running segmentation with individual estimates from hierarchical Bayes choice models without any mention of the possible complications that might accompany such an approach.  Actually, ...

Read more »

Does It Make Sense to Segment Using Individual Estimates from a Hierarchical Bayes Choice Model?

March 25, 2013
By
Does It Make Sense to Segment Using Individual Estimates from a Hierarchical Bayes Choice Model?

I raise this question because we see calls for running segmentation with individual estimates from hierarchical Bayes choice models without any mention of the possible complications that might accompany such an approach.  Actually, ...

Read more »

Does It Make Sense to Segment Using Individual Estimates from a Hierarchical Bayes Choice Model?

March 25, 2013
By
Does It Make Sense to Segment Using Individual Estimates from a Hierarchical Bayes Choice Model?

I raise this question because we see calls for running segmentation with individual estimates from hierarchical Bayes choice models without any mention of the possible complications that might accompany such an approach.  Actually, ...

Read more »

Learning SQL – review

March 25, 2013
By

To give you all some time to digest my review of the Art of R Programming, I thought why not continue this trend of book reviews with a review of Learning SQL. This book came highly recommended by some colleagues of mine as a place to whet your SQL app...

Read more »

Less is more

March 24, 2013
By
Less is more

“Less is More” is a bit of a funny title for a mathematical blog! Garlic bread and Ice Cream Sundaes Back in the seventies, garlic bread became very popular in our household. I loved its buttery, salty, garlicky goodness, and … Continue reading →

Read more »

How to modify a JAGS+rjags (or BUGS) program to include new parameters

March 24, 2013
By
How to modify a JAGS+rjags (or BUGS) program to include new parameters

A central goal of providing you with lots of examples of programs, that do Bayesian parameter estimation in JAGS (BUGS) and rjags, is for you to be able to expand and modify the programs for your own needs. The book includes several cases in which prog...

Read more »

Sunday data/statistics link roundup (3/24/2013)

March 24, 2013
By

My Coursera Data Analysis class is done for now! All the lecture notes are on Github all the videos are on Youtube. They are tagged by week with tags “Week x”. After ENAR the comments on how to have better stats … Continue reading →

Read more »

Estimating the Decay Rate and the Half-Life of DDT in Trout – Applying Simple Linear Regression with Logarithmic Transformation

March 24, 2013
By
Estimating the Decay Rate and the Half-Life of DDT in Trout – Applying Simple Linear Regression with Logarithmic Transformation

This blog post uses a function and a script written in R that were displayed in an earlier blog post. Introduction This is the second of a series of blog posts about simple linear regression; the first was written recently on some conceptual nuances and subtleties about this model.  In this blog post, I will use […]

Read more »

My Own R Function and Script for Simple Linear Regression – An Illustration with Exponential Decay of DDT in Trout

March 24, 2013
By
My Own R Function and Script for Simple Linear Regression – An Illustration with Exponential Decay of DDT in Trout

Here is the function that I wrote for doing simple linear regression, as alluded to in my blog post about simple linear regression on log-transformed data on the decay of DDT concentration in trout in Lake Michigan.  My goal was to replicate the 4 columns of the output from applying summary() to the output of lm(). […]

Read more »

Glimpses of Data: The CBO’s Snapshots

March 24, 2013
By
Glimpses of Data: The CBO’s Snapshots

Arguments in data visualization are so fierce because the stakes are so low is a great zinger that I’ve heard a few times recently. But it’s not always true. Data visualization influences important decisions every day. The Congressional Budget Office’s new snapshots are but one example. The role of the Congressional Budget Office (CBO) is to provide information to members of the U.S. Congress so they can make better decisions.…

Read more »

Parsing complex text files using regular expressions and vectorization

March 24, 2013
By

When text data is in a nice CSV format, read.csv is enough to parse it into a useable format. But if this is not the case, getting the data into a useable format is not so straightforward. In this post… See more ›

Read more »

In which I disagree with John Maynard Keynes

March 23, 2013
By

In his review in 1938 of Historical Development of the Graphical Representation of Statistical Data, by H. Gray Funkhauser, for The Economic Journal, the great economist writes: Perhaps the most striking outcome of Mr. Funkhouser’s researches is the fact of the very slow progress which graphical methods made until quite recently. . . . In [...]

Read more »

Introduction to Simulation using R

March 23, 2013
By
Introduction to Simulation using R

We had a great turnout yesterday for our Zero to R Hero workshop at the Quebec Centre for Biodiversity Science. We went from the absolute basics of the command line, to the intricacies of importing data, and finally we had a look at plotting using ggplot2. We didn’t have time to get to this extra module […]

Read more »

Belly Button Biodiversity: Part Four

March 22, 2013
By
Belly Button Biodiversity: Part Four

March 22, 2013Well, I've started testing the predictions I made in my previous post, and exactly as I expected and deserved, I am getting killed.  The actual results pretty consistently show more species than I predicted, sometimes way more.I have...

Read more »

Likelihood Ratio ≠ 1 Journal

March 22, 2013
By
Likelihood Ratio ≠ 1 Journal

Dan Kahan writes: The basic idea . . . is to promote identification of study designs that scholars who disagree about a proposition would agree would generate evidence relevant to their competing conjectures—regardless of what studies based on such designs actually find. Articles proposing designs of this sort would be selected for publication and only [...]

Read more »

Study on Creative Data Visualization

March 22, 2013
By

To explore how we can make it easier to create new visualization designs, we are running a study based on a new approach, called visualization primitives. It lets you map data to the properties of objects like rectangles and ellipses. Build something w...

Read more »

Data visualisation talk: Presentation using reports package

March 22, 2013
By
Data visualisation talk: Presentation using reports package

Why I had used html5 for my today’s talk?   My last presentation was prepared using html5. This time I wanted  some innovation while making the slides.  I prepared  first few slides in Jessyink. Then I got to know that my … Continue reading → The post Data visualisation talk: Presentation using reports package appeared first on Fiddling with data and code.

Read more »


Subscribe

Email:

  Subscribe