March 2014

Stochastic search variable selection in JAGS

March 22, 2014 | Maxwell B. Joseph

Stochastic search variable selection (SSVS) identifies promising subsets of multiple regression covariates via Gibbs sampling (George and McCulloch 1993). Here’s a short SSVS demo with JAGS and R. Assume we have a multiple regression problem: We suspect only a subset of the elements of $\boldsymbol{\beta}$ are non-zero, i.e. ... [Read more...]

Sun and moon paths in daily sky

March 22, 2014 | Dan Kelley Blog/R

Introduction This blog started because I was interested in the sunrise position on the winter solstice of 2013. With the Spring equinox, I’m trying something different: plotting the paths of the sun and moon through the day. The code shown here produces a daily graph, and I have a cron ... [Read more...]

Le Monde puzzle [#857]

March 21, 2014 | xi'an

A rather bland case of Le Monde mathematical puzzle : Two positive integers x and y are turned into s=x+y and p=xy. If Sarah and Primrose are given S and P, respectively, how can the following dialogue happen? I am sure you cannot find my number Now you ...
[Read more...]

Recreational Data

March 21, 2014 | Tony Hirst

Part of my weekend ritual is to buy the weekend papers and have a go at the recreational maths problems that are Sudoku and Killer. I also look for news stories with a data angle that might prompt a bit of recreational data activity… In a paper that may or ... [Read more...]

Aggregating spatial points by clusters

March 21, 2014 | Robin Lovelace - R

With ubiquitous collection devices (e.g. smartphones), having too much data may become an increasingly common problem for spatial analysts, even with increasingly powerful computers. This is ironic, because a few short decades ago, too little data was a primary constraint. This tutorial builds on the 'Attribute joins' section of ... [Read more...]

Frequentist German Tank Problem

March 20, 2014 | Jacob Simmering

The German Tank Problem: The Frequentist Way Many things are given a serial number and often that serial number, logically, starts at 1 and for each new unit is increased by 1. For example, German tanks in World War II had several parts with serial numbers. By collecting the value of these ... [Read more...]

Help Me Understand bfast breakpoints

March 20, 2014 | klr

The R package bfast enthralls me.  I have posted 3 times on bfast but still did not understand the impact of the h parameter.  Armed now with some d3.js, angular.js, and rCharts I thought I could see it better with a fancy interactive visualization.  Here is the result when ... [Read more...]

Data Sets for Data Science

March 20, 2014 | Joseph Rickert

by Joseph Rickert Recently, I had the opportunity to be a member of a job panel for Mathematics, Economics and Statistics students at my alma mater, CSUEB (California State University East Bay). In the context of preparing for a career in data science a student at the event asked: “Where ... [Read more...]

Seasonal, or periodic, time series

March 20, 2014 | arthur charpentier

Monday, in our MAT8181 class, we’ve discussed seasonal unit roots from a practical perspective (the theory will be briefly mentioned in a few weeks, once we’ve seen multivariate models). Consider some time series , for instance traffic on French roads, __ autoroute=read.table( + "http://freakonometrics.blog.free.fr/public/... [Read more...]

Why multiple imputation?

March 20, 2014 | Michael kao

Background In the forth coming week, I will be giving a presentation on the fundamentals of imputation to my colleagues. One of the most important idea I would like to present is multiple imputation. In my last post, I have given a small example of multiple imputation, but it does ... [Read more...]

Albany, NY R Users Group

March 20, 2014 | Jason Bryer

I have started an R Users Group for the Albany, NY area. Hopefully we get enough interest that we can host a meeting in the next couple of months. Please feel free to share with your colleagues and friends. www.meetup.com/Albany-R-Users-Group Feel fr... [Read more...]
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