Convincing Evidence

August 13, 2013
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Keith O’Rourke and I wrote an article that begins: Textbooks on statistics emphasize care and precision, via concepts such as reliability and validity in measurement, random sampling and treatment assignment in data collection, and causal identification and bias in estimation. But how do researchers decide what to believe and what to trust when choosing which […]The post Convincing Evidence appeared first on Statistical Modeling, Causal Inference, and Social Science.

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Test scores and grades predict job performance (but maybe not at Google)

August 13, 2013
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Eric Loken writes: If you’re used to Google upending conventional wisdom, then yesterday’s interview with Laszlo Bock in the New York Times did not disappoint. Google has determined that test scores and transcripts are useless because they don’t predict performance among its employees. . . . I [Loken] am going to assume they’re well aware […]The post Test scores and grades predict job performance (but maybe not at Google) appeared…

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Various ways to show variability

August 13, 2013
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Various ways to show variability

Reader Doeke W. sends me to this chart. I like many aspects of this exercise. This chart displays the results of an experiment conducted by a computer games company to show that the new build ("249") renders frames faster than...

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When Discussing Confidence Level With Others…

August 13, 2013
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When Discussing Confidence Level With Others…

This post spawned from a discussion I had the other day. Confidence intervals are notoriously a difficult topic for those unfamiliar with statistics. I can’t really think of another statistical topic that is so widely published in newspaper articles, television, and elsewhere that so few people really understand. It’s been this way since the moment […]

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Damaged and can’t be opened

August 13, 2013
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Perhaps you tried to open some application or mount some DMG on your Mac and encountered the following alarming message “[Application] is damaged and can’t be opened. You should move it to the trash.” Perhaps it is indeed damaged. But more likely it is just not signed by its developer or not made available from […]

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Genetic drift simulation

August 13, 2013
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Genetic drift simulation

While preparing for the new teaching semester I have created an implementation of NetLogo GenDrift P local in GNU R.The model works as follows. Initially a square grid having side size is randomly populated with n types of agen...

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Installing a SSD drive into a mid-2007 iMac

August 13, 2013
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Installing a SSD drive into a mid-2007 iMac

I have a mid-2007 iMac with a 2.4 GHz Core2Duo processor and despite the fact that it is already six years old, it still does a good job. However, compared to a friend's recent MacBook Air with a solid state disk (SSD) it feels sluggish when opening pr...

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The Golden Age of Information Graphics

August 13, 2013
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The Golden Age of Information Graphics

Infographics today are mostly pointless decorations around a few simple facts that add nothing meaningful. But information graphics once deserved their name with dense, meticulously-drawn, well-researched information. Here is an example from 1944. The Lawrence Livermoore National Lab recently posted this Chart of Electromagnetic Radiations, which was originally published in 1944, on their flickr stream. […]

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Krugman’s "Very Serious Person" (VSP)

August 13, 2013
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Paul Krugman's term "VSP" is simply wonderful: so concise and apt, capturing a personage previously vaguely sensed but never fully grasped. And of course it's funny too. Hence it's even better than classics from decades past, like WASP (coined, by the ...

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Short tales of two NCAA basketball conferences (Big 12 and West Coast) using graphs

August 12, 2013
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Short tales of two NCAA basketball conferences (Big 12 and West Coast) using graphs

UPDATE: THE BLOG/SITE HAS MOVED TO GITHUB. THE NEW LINK FOR THE BLOG/SITE IS patilv.github.io and THE LINK TO THIS POST IS: http://bit.ly/1kvathJ. PLEASE UPDATE ANY BOOKMARKS YOU MAY HAVE.Having been at the University of Kansas (Kansas Jayhawks) as a s...

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Exploratory Data Analysis: The 5-Number Summary – Two Different Methods in R

Exploratory Data Analysis: The 5-Number Summary – Two Different Methods in R

Introduction Continuing my recent series on exploratory data analysis (EDA), today’s post focuses on 5-number summaries, which were previously mentioned in the post on descriptive statistics in this series.  I will define and calculate the 5-number summary in 2 different ways that are commonly used in R.  (It turns out that different methods arise from […]

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Understanding the ENSEMBL Schema

August 12, 2013
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Understanding the ENSEMBL Schema

ENSEMBL is a frequently used resource for various genomics and transcriptomics tasks.  The ENSEMBL website and MART tools provide easy access to their rich database, but ENSEMBL also provides flat-file downloads of their entire database and a publ...

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Fixing the race, ethnicity, and national origin questions on the U.S. Census

August 12, 2013
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Fixing the race, ethnicity, and national origin questions on the U.S. Census

In his new book, “What is Your Race? The Census and Our Flawed Efforts to Classify Americans,” former Census Bureau director Ken Prewitt recommends taking the race question off the decennial census: He recommends gradual changes, integrating the race and national origin questions while improving both. In particular, he would replace the main “race” question […]The post Fixing the race, ethnicity, and national origin questions on the U.S. Census appeared…

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No use crying over 2% milk

August 12, 2013
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No use crying over 2% milk

image from http://lulzshirts.com/ Last week, I had dinner with my friend Cesare, who is a medical researcher. That was the first time I heard of the marketing scam known as "2% milk" or "1% millk" or "'fat free' milk". Sure, I know what 2% milk is. I've drunk some before. But I don't really know what 2% means. You see, I was comparing that to whole milk, thinking it contains…

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Do dryer balls reduce drying time?

August 12, 2013
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Do dryer balls reduce drying time?

Editor's Note: My 8th grade son, David, created a poster that he submitted to the 2013 ASA Poster Competition. The competition encourages students to display "two or more related graphics that summarize a set of data, look at the data from different points of view, and answer specific questions about [...]

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Teaching with School League tables

August 11, 2013
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Teaching with School League tables

NCEA League tables in the newspaper My husband ran for cover this morning when he saw high school NCEA (National Certificates of Educational Achievement)  league tables in the Press. However, rather than rave at him yet again, I will grasp … Continue reading →

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E.S. Pearson: “Ideas came into my head as I sat on a gate overlooking an experimental blackcurrant plot”

August 11, 2013
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E.S. Pearson: “Ideas came into my head as I sat on a gate overlooking an experimental blackcurrant plot”

Today is Egon Pearson’s birthday (11 Aug., 1895-12 June, 1980); and here you see my scruffy sketch of him, at the start of my book, “Error and the Growth of Experimental Knowledge” (EGEK 1996). As Erich Lehmann put it in his EGEK review, Pearson is “the hero of Mayo’s story” because I found in his work, […]

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How to Use Autocorreation Function (ACF) to Determine Seasonality

August 11, 2013
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How to Use Autocorreation Function (ACF) to Determine Seasonality

In my previous post, I wrote about using the autocorrelation function (ACF) to determine if a timeseries is stationary. Now, let us use the ACF to determine seasonality. This is a relatively straightforward procedure. Firstly, seasonality in a timeseries refers to predictable and recurring trends and patterns over a period of time, normally a year. […]

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Universities, Parking, and Bonding

August 11, 2013
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Ya gotta love Bill Barnett's email sig:"A university is `a series of individual faculty entrepreneurs held together by a common grievance over parking.`Clark Kerr, President, University of California, 1958-1967."I refuse to drive to work anym...

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Modeling Match Results in La Liga Using a Hierarchical Bayesian Poisson Model: Part three.

August 11, 2013
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Modeling Match Results in La Liga Using a Hierarchical Bayesian Poisson Model: Part three.

In part one and part two of Modeling Match Results in La Liga Using a Hierarchical Bayesian Poisson Model I developed a model for the number of goals in football matches from five seasons of La Liga, the premier Spanish football league. I’m now re...

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Blogs and Academic Tenure

August 11, 2013
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Blogs and Academic Tenure

A recent article in the Chronicle of Higher Education caught my attention the other day with its argument that academic blogging should be credited toward a person’s scholarly record when considering the person for tenure.  Let me start with two stipulations that weren’t explicitly made in the Chronicle article. First, presumably the credit is restricted […]

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Debutante Hill

August 11, 2013
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Debutante Hill

I was curious so I ordered a used copy. It was pretty good. It fit in my pocket and I read it on the plane. It was written in a bland, spare manner, not worth reading for any direct insights it would give into human nature, but the plot moved along. And the background material […]The post Debutante Hill appeared first on Statistical Modeling, Causal Inference, and Social Science.

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The birthday problem

August 10, 2013
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The birthday problem

A friend with a baby who was born a couple weeks late commented that he would’ve liked a website that gave an estimated due date that was something more accurate than the usual “last menstrual period + 40 weeks.” I did a quick google and found this and this. Based on their descriptions of what […]The post The birthday problem appeared first on Statistical Modeling, Causal Inference, and Social Science.

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