Out of Sight, Out of Mind: Every Known Drone Attack in Pakistan

March 26, 2013
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Out of Sight, Out of Mind: Every Known Drone Attack in Pakistan

The narrative infographic "Out of Sight, Out of Mind: A visualization of drone strikes in Pakistan since 2004" [pitchinteractive.com] by Pitch Interactive illustrates the frequency and human impact of the drone attacks in Pakistan. Once a year Pitch...

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Out of Sight, Out of Mind: Every Known Drone Attack in Pakistan

March 26, 2013
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Out of Sight, Out of Mind: Every Known Drone Attack in Pakistan

The narrative infographic "Out of Sight, Out of Mind: A visualization of drone strikes in Pakistan since 2004" [pitchinteractive.com] by Pitch Interactive illustrates the frequency and human impact of the drone attacks in Pakistan. Once a year Pitch...

Read more »

ChainLadder 0.1.5-6 released on CRAN

March 26, 2013
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ChainLadder 0.1.5-6 released on CRAN

Last week we released version 0.1.5-6 of the ChainLadder package on CRAN. The ChainLadder package provides statistical models, which are typically used for the estimation of outstanding claims reserves in general insurance. The package vignette gives a...

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Large Scale Linear Mixed Model

March 26, 2013
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Large Scale Linear Mixed Model

Update at the end:****************************;Bob at r4stats.com claimed that a linear mixed model with over 5 million observations and 2 million levels of random effects was fit using lme4 package in R:I am always interested in large scale mixed mod...

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Significant P-Values and Overlapping Confidence Intervals

March 26, 2013
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Significant P-Values and Overlapping Confidence Intervals

There are all sorts of problems with p-values and confidence intervals and I have no intention (or the time) to cover all those problems right now.  However, a big problem is that most people have no idea what p-values really mean. Here is one example of a common problem with p-values and how it relates [...]

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The harm done by tests of significance

March 25, 2013
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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 [...]

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Ordinal data with JAGS

March 25, 2013
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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...

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Podcast #6: Data Analysis MOOC Post-mortem

March 25, 2013
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Jeff and I talk about Jeff’s recently completed MOOC on Data Analysis.

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Free magazine, negative heights, and statistical methods

March 25, 2013
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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…

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How to plot a discontinuous function

March 25, 2013
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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 [...]

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Submit a talk for the first R in Insurance conference

March 25, 2013
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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 ...

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

March 25, 2013
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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, ...

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

March 25, 2013
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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, ...

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

March 25, 2013
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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
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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...

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Less is more

March 24, 2013
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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 →

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

March 24, 2013
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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...

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

March 24, 2013
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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 →

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

March 24, 2013
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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 […]

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

March 24, 2013
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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(). […]

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Glimpses of Data: The CBO’s Snapshots

March 24, 2013
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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.…

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Parsing complex text files using regular expressions and vectorization

March 24, 2013
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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 ›

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In which I disagree with John Maynard Keynes

March 23, 2013
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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 [...]

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