More on Uncle Woody

May 13, 2012
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Here. See also here. He did Wacky Packs!

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Zero Tolerance Search : 24 year old neuroscientist

May 12, 2012
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Zero Tolerance Search : 24 year old neuroscientist

[The idea behind 'zero tolerance search' posts is to illustrate real life search interactions that show how far we have to go in leveraging the explicit and implicit data in the web and elsewhere.] Yesterday, I heard part of an...

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Excellent Visualization of Network Effect

May 12, 2012
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Excellent Visualization of Network Effect

 

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Question 2 of my final exam for Design and Analysis of Sample Surveys

May 12, 2012
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2. Which of the following are useful goals in a pilot study? (Indicate all that apply.) (a) You can search for statistical significance, then from that decide what to look for in a confirmatory analysis of your full dataset. (b) You can see if you find statistical significance in a pre-chosen comparison of interest. (c) [...]

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US market portrait 2012 week 20

May 12, 2012
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US market portrait 2012 week 20

US large cap market returns. Fine print The data are from Yahoo Almost all of the S&P 500 stocks are used The initial post was “Replacing market indices” The R code is in marketportrait_funs.R Subscribe to the Portfolio Probe blog by Email

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black and Black, white and White

May 12, 2012
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black and Black, white and White

I’ve always thought it looked strange to see people referred to in print as Black or White rather than black or white. For example consider this sentence: “A black guy was walking down the street and he saw a bunch of white guys standing around.” That looks fine, whereas “A Black guy was walking down [...]

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ASA fellows

May 12, 2012
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ASA fellows

Being freshly elected ASA Fellow (yay!), I just received the list of 2012 ASA Fellows. Among whose, let me mention Sudipto Banerjee, University of Minnesota, Minneapolis, Minnesota, elected “For theoretical, methodological and applied research in spatiotemporal statistical modeling, especially as applied to problems in environmetrics, ecology, occupational health, agriculture and economics, for professional work at [...]

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Hierarchical diagrams read bottom to top; JAGS/BUGS code reads top to bottom

May 12, 2012
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Hierarchical diagrams read bottom to top; JAGS/BUGS code reads top to bottom

Consider a generic model for simple linear regression. The data are metric values, modeled as coming from a normal distribution that has mean parameter μ=β0+β1x1 and precision parameter τ (=1/σ2). The priors on the intercept and slope parameters (...

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Hierarchical diagrams read bottom to top; JAGS/BUGS code reads top to bottom

May 12, 2012
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Hierarchical diagrams read bottom to top; JAGS/BUGS code reads top to bottom

Consider a generic model for simple linear regression. The data are metric values, modeled as coming from a normal distribution that has mean parameter μ=β0+β1x1 and precision parameter τ (=1/σ2). The priors on the intercept and slope parameters (...

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Question 1 of my final exam for Design and Analysis of Sample Surveys

May 11, 2012
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1. Suppose that, in a survey of 1000 people in a state, 400 say they voted in a recent primary election. Actually, though, the voter turnout was only 30%. Give an estimate of the probability that a nonvoter will falsely state that he or she voted. (Assume that all voters honestly report that they voted.) [...]

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Video Tip: Use Ensembl BioMart to Quickly Get Ortholog Information

May 11, 2012
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Video Tip: Use Ensembl BioMart to Quickly Get Ortholog Information

A few weeks ago I showed you how to convert gene IDs with BioMart. Yesterday I hosted a workshop on the Ensembl Genome Browser, given by Dr. Bert Overduin from EBI-EMBL. He gave several examples of very useful tasks that you can do very quickly and eas...

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Interview with Hadley Wickham – Developer of ggplot2

May 11, 2012
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Interview with Hadley Wickham – Developer of ggplot2

Hadley Wickham Hadley Wickham is the Dobelman Family Junior Chair of Statistics at Rice University. Prior to moving to Rice, he completed his Ph.D. in Statistics from Iowa State University. He is the developer of the wildly popular ggplot2 software...

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FatFonts: New Font Links Value of a Number to Amount of Pixels Shown

May 11, 2012
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FatFonts: New Font Links Value of a Number to Amount of Pixels Shown

FatFonts [fatfonts.org] is a novel numeric typeface for data visualization purposes. The design of FatFonts is based on Arabic numerals, but the amount of ink (i.e. dark pixels) used for each digit is proportional to its quantitative value. This font ...

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Are our referencing errors undermining our scholarship and credibility? The case of expatriate failure rates

May 11, 2012
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Thomas Basbøll points to this ten-year-old article from Anne-Wil Harzing on the consequences of sloppy citations. Harzing tells the story of an unsupported claim that is contradicted by published data but has been presented as fact in a particular area of the academic literature. She writes that “high expatriate failure rates [with "expatriate failure" defined [...]

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HTML5: Flow map of internal migration in England & Wales

May 11, 2012
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HTML5: Flow map of internal migration in England & Wales

At the start of this year, I wrote a brief post on how we’ve been looking closely at the emergence of HTML5 as a visualisation platform. This week, we’ve published the first fruit of those labours – an interactive flow map of internal migration data for England & Wales: The aim here was to really …Read More

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Porting cdplot to ggplot2

May 11, 2012
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Porting cdplot to ggplot2

Last week I published a post on plotting tables in ggplot2. So the next natural step is to port cdplot to allow simple visualization of categorical variables against a numerical predictor.First part of the story covers binary variables. In th...

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Datavisualization.ch: A Carefully Selected List of Recommended Tools

May 11, 2012
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Datavisualization.ch: A Carefully Selected List of Recommended Tools

07 MAY 2012 BENJAMIN WIEDERKEHR TOOLS FLASH, JAVASCRIPT, PROCESSING, RA Carefully Selected List of Recommended ToolsWhen I meet with people and talk about our work, I get asked a lot what technology we use to create intera...

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What is the (expensive) miracle drug that cut colon cancer deaths by 20%?

May 11, 2012
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What is the (expensive) miracle drug that cut colon cancer deaths by 20%?

Andrew Gelman linked to this great reporting by Reuters on U.S. healthcare economics. It's a must-read. Be patient, and read through to the end even though it's a long piece. Andrew cites statistician Don Berry who explains what "lead time bias" is, and why survival time is always the wrong metric to use in evaluating health outcomes. Survival time is the time from diagnosis to death. By doing more screening…

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My final exam for Design and Analysis of Sample Surveys

May 10, 2012
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We had 28 class periods, so I wrote an exam with an approximate correspondence of one question per class. Rather than dumping the exam in your lap all at once, I’ll post the questions once per day. Then each day I’ll post the answer to yesterday’s questions. So it will be 29 days in all. [...]

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My final exam for Design and Analysis of Sample Surveys

May 10, 2012
By

We had 28 class periods, so I wrote an exam with an approximate correspondence of one question per class. Rather than dumping the exam in your lap all at once, I’ll post the questions once per day. Then each day I’ll post the answer to yesterday’s questions. So it will be 29 days in all. [...]

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Easel.ly Debutes Online Editor of Infographics

May 10, 2012
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Easel.ly Debutes Online Editor of Infographics

San Diego-based start-up Easel.ly [easel.ly] is offering a beta service that allows lay people to design and implement their own "infographics" via an online editor. The user-based customization of infographics seems to be the next phase after the aut...

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Simple Moving Average Strategy with a Volatility Filter: Follow-Up Part 3

May 10, 2012
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Simple Moving Average Strategy with a Volatility Filter: Follow-Up Part 3

In part 2, we saw that adding a volatility filter to a single instrument test did little to improve performance or risk adjusted returns. How will the volatility filter impact a multiple instrument portfolio? In part 3 of the follow up, I will evaluate the impact of the volatility filter on a multiple instrument test. … Continue reading →

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