Timeline of Statistics

March 22, 2014
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Timeline of Statistics

getstats In 2010 the Royal Statistical Society (RSS) launched the getstats campaign in order to bring statistics to various groups like …Continue reading →

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Timeline of Statistics

March 22, 2014
By
Timeline of Statistics

getstats In 2010 the Royal Statistical Society (RSS) launched the getstats campaign in order to bring statistics to various groups like …Continue reading →

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Picking pennies in front of a steamroller: A parable comes to life

March 22, 2014
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From 2011: Chapter 1 On Sunday we were over on 125 St so I stopped by the Jamaican beef patties place but they were closed. Jesus Taco was next door so I went there instead. What a mistake! I don’t know what Masanao and Yu-Sung could’ve been thinking. Anyway, then I had Jamaican beef patties […]The post Picking pennies in front of a steamroller: A parable comes to life appeared…

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Postdoc at Rennes on multilevel missing data imputation

March 22, 2014
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Julie Josse sends along this job announcement: A post-doctoral position is available in the applied mathematics department of Agrocampus Rennes. The postdoc will be funded by the Henri Lebesgue Center (see http://www.lebesgue.fr/) if the application is selected. Applicants are expected to send their application before 31 March 2014. The research focus is on development of […]The post Postdoc at Rennes on multilevel missing data imputation appeared first on Statistical Modeling,…

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Using nls in place of the delta method

March 22, 2014
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This was originally posted at Point Mass Prior and features MathML. If you’re viewing from StatsBlogs the math probably won’t show up properly and it would be beneficial to view the post here. It’s been a while since my last post which was on using the delta method in R with a specific application to finding the ‘x’ value that corresponds to the maximum/minimum value in a quadratic regression. This…

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Le Monde puzzle [#857]

March 21, 2014
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Le Monde puzzle [#857]

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 told me that, I can, it is […]

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Death of A. L. Nagar

March 21, 2014
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Death of A. L. Nagar

I was saddened to learn that Anirudh Lal Nagar passed away on 4 February 2014. Nagar was an exceptional  Indian statistician and econometrician who made many fundamental contributions to our discipline. He was 83 years old at the time of his ...

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The sampling frame is a list, but not every list is a sampling frame

March 21, 2014
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The sampling frame is a list, but not every list is a sampling frame

Yesterday and today, I spent some time marking the in-course assessment (ICA) for my course (the teaching term is over next week $-$ yay!). The course is called "Social Statistics" and it's intended to deal with surveys and sampling. However, sinc...

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Random matrices in the news

March 21, 2014
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From 2010: Mark Buchanan wrote a cover article for the New Scientist on random matrices, a heretofore obscure area of probability theory that his headline writer characterizes as “the deep law that shapes our reality.” It’s interesting stuff, and he gets into some statistical applications at the end, so I’ll give you my take on it. But […]The post Random matrices in the news appeared first on Statistical Modeling, Causal Inference, and…

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Some chart types are not scalable

March 21, 2014
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Some chart types are not scalable

Peter Cock sent this Venn diagram to me via twitter. (Original from this paper.) For someone who doesn't know genetics, it is very hard to make sense of this chart. It seems like there are five characteristics that each unit...

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Report of MPs’ inquiry into UK statistics and open data published – StatsLife

March 21, 2014
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Report of MPs’ inquiry into UK statistics and open data published – StatsLife

From: http://www.statslife.org.uk/news/1299-report-of-mps-inquiry-into-uk-statistics-and-open-data-published?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+rss-enews+%28StatsLife+-+all+the+latest+statistics+news%29Written by W...

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R: Text Mining on Twitter #PrayForMH370 Malaysia Airlines

March 21, 2014
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R: Text Mining on Twitter #PrayForMH370 Malaysia Airlines

It's been two weeks for search and rescue operations of the Malaysia Airlines Flight MH370, after it vanished from the radar on March 8, 2014. And wherever they are, we hope and pray for them.Photo from VENUS - Wall of Hope & Prayers for MH370In th...

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Pre-processing for approximate Bayesian computation in image analysis

March 20, 2014
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Pre-processing for approximate Bayesian computation in image analysis

With Matt Moores and Kerrie Mengersen, from QUT, we wrote this short paper just in time for the MCMSki IV Special Issue of Statistics & Computing. And arXived it, as well. The global idea is to cut down on the cost of running an ABC experiment by removing the simulation of a humongous state-space vector, […]

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It is time for RData files to become the standard for Data Transfer

March 20, 2014
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It is time for RData files to become the standard for Data Transfer

It is time Rdata files become the primary means of disseminating publicly available data online.1. R is the most efficient Statistical software at compressing dataI was recently attempting to download weather data from the US government and found mysel...

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How to make an absurd twitter bot in python

March 20, 2014
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How to make an absurd twitter bot in python

In my last post, I outlined the steps I took to programmatically mimic the wine reviews of a dilettante sommelier. In this post, I'll explain the steps I took to create the twitter bot @HorseWineReview which combines a random wine… Continue reading →

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Teaching Bayesian applied statistics to graduate students in political science, sociology, public health, education, economics, . . .

March 20, 2014
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Teaching Bayesian applied statistics to graduate students in political science, sociology, public health, education, economics, . . .

One of the most satisfying experiences for an academic is when someone asks a question that you’ve already answered. This happened in the comments today. Daniel Gotthardt wrote: So for applied stat courses like for sociologists, political scientists, psychologists and maybe also for economics, what do we actually want to accomplish with our intro courses? […]The post Teaching Bayesian applied statistics to graduate students in political science, sociology, public health,…

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Visualize coverage for targeted NGS (exome) experiments

March 20, 2014
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Visualize coverage for targeted NGS (exome) experiments

I'm calling variants from exome sequencing data and I need to evaluate the efficiency of the capture and the coverage along the target regions.This sounds like a great use case for bedtools, your swiss-army knife for genomic arithmetic and interval man...

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Big Data and SQL

March 20, 2014
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I happen to think that SQL is a very viable option for analyzing big data.  I was thinking about this when I a book review recently:For instance, Siegel reports, people who buy small felt pads that adhere to the bottom of chair legs (to protect th...

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The 80/20 rule of statistical methods development

March 20, 2014
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The 80/20 rule of statistical methods development

Developing statistical methods is hard and often frustrating work. One of the under appreciated rules in statistical methods development is what I call the 80/20 rule (maybe could even by the 90/10 rule). The basic idea is that the first … Continue reading →

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Seasonal, or periodic, time series

March 20, 2014
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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 ...

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The candy weighing demonstration, or, the unwisdom of crowds

March 20, 2014
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From 2008: The candy weighing demonstration, or, the unwisdom of crowds My favorite statistics demonstration is the one with the bag of candies. I’ve elaborated upon it since including it in the Teaching Statistics book and I thought these tips might be useful to some of you. Preparation Buy 100 candies of different sizes and […]The post The candy weighing demonstration, or, the unwisdom of crowds appeared first on Statistical…

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Machine Learning Lesson of the Day – Overfitting and Underfitting

Machine Learning Lesson of the Day – Overfitting and Underfitting

Overfitting occurs when a statistical model or machine learning algorithm captures the noise of the data.  Intuitively, overfitting occurs when the model or the algorithm fits the data too well.  Specifically, overfitting occurs if the model or algorithm shows low bias but high variance.  Overfitting is often a result of an excessively complicated model, and […]

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Mathematical and Applied Statistics Lesson of the Day – The Central Limit Theorem Applies to the Sample Mean

Mathematical and Applied Statistics Lesson of the Day – The Central Limit Theorem Applies to the Sample Mean

Having taught and tutored introductory statistics numerous times, I often hear students misinterpret the Central Limit Theorem by saying that, as the sample size gets bigger, the distribution of the data approaches a normal distribution.  This is not true.  If your data come from a non-normal distribution, their distribution stays the same regardless of the […]

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