Lab: A Maze of Twisty Little Passages (Introduction to Statistical Computing)

November 13, 2012
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Lab 9: In which we build a little web-crawler to calculate page-rank (the hard way), so as to practice working with text, regular expressions, and Markov chains. Supplied code, which may or may not contain deliberate bugs. (This assignment ripped o...

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Several Hundred Degrees of Separation (Introduction to Statistical Computing)

November 13, 2012
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Homework 10: in which we refine our web-crawler from lab, by way of further working with regular expressions, and improving our estimates of page-rank. (This assignment ripped off from Vince Vu, with permission.) Introduction to Statistical Comp...

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Final Projects (Introduction to Statistical Computing)

November 13, 2012
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Available options for the final group project in statistical computing. (Some of these projects are ripped off from Vince Vu, with permission.) Introduction to Statistical Computing

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Course Announcement: Advanced Data Analysis from an Elementary Point of View

November 13, 2012
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It's that time again: 36-402, Advanced Data Analysis, Spring 2013 Description: This course introduces modern methods of data analysis, building on the theory and application of linear models from 36-401. Topics include nonlinear regression, nonparam...

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How to Lie With Statistics example number 12,498,122

November 12, 2012
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This post is by Phil Price. Bill Kristol notes that “Four presidents in the last century have won more than 51 percent of the vote twice: Roosevelt, Eisenhower, Reagan and Obama”. I’m not sure why Kristol, a conservative, is promoting the idea that Obama has a mandate, but that’s up to him. I’m more interested [...]

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You can’t play a broken link

November 12, 2012
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You can’t play a broken link

Just like James Morrison and Nelly Furtado say, you really can't play a broken string. And quite similarly, you just can't use a broken link.I always find it very annoying when, while browsing a website, I find a broken link. You fall victim to the pro...

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Some Thoughts on Teaching R to 50,000 Students

November 12, 2012
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Two weeks ago I finished teaching my course Computing for Data Analysis through Coursera. Since then I’ve had some time to think about how it went, what I learned, and what I’d do differently. First off, let me say that it was a lot of fun....

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Some Thoughts on Teaching R to 50,000 Students

November 12, 2012
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Two weeks ago I finished teaching my course Computing for Data Analysis through Coursera. Since then I’ve had some time to think about how it went, what I learned, and what I’d do differently. First off, let me say that it was a lot of fun....

Read more »

Some Thoughts on Teaching R to 50,000 Students

November 12, 2012
By

Two weeks ago I finished teaching my course Computing for Data Analysis through Coursera. Since then I’ve had some time to think about how it went, what I learned, and what I’d do differently. First off, let me say that it was a lot of fun....

Read more »

Some Thoughts on Teaching R to 50,000 Students

November 12, 2012
By

Two weeks ago I finished teaching my course Computing for Data Analysis through Coursera. Since then I’ve had some time to think about how it went, what I learned, and what I’d do differently. First off, let me say that it was a lot of fun....

Read more »

Thinking like a statistician (continuously) rather than like a civilian (discretely)

November 12, 2012
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John Cook writes: When I hear someone say “personalized medicine” I want to ask “as opposed to what?” All medicine is personalized. If you are in an emergency room with a broken leg and the person next to you is lapsing into a diabetic coma, the two of you will be treated differently. The aim [...]

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How to fail three tests in one chart

November 12, 2012
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How to fail three tests in one chart

The November issue of Bloomberg Markets published the following pair of pyramid charts: This chart fails a number of tests: Tufte's data-ink ratio test There are a total of six data points in the entire graphic. A mathematician would say...

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Inverse hyperbolic functions in SAS

November 12, 2012
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Inverse hyperbolic functions in SAS

I was recently asked, "Does SAS support computing inverse hyperbolic trigonometric functions?" I was pretty sure that I had used the inverse hyperbolic trig functions in SAS, so I was surprised when I read the next sentence: "I ask because I saw a Usage Note that says these functions are [...]

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The guts of a statistical factor model

November 12, 2012
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The guts of a statistical factor model

Specifics of statistical factor models and of a particular implementation of them. Previously Posts that are background for this one include: Three things factor models do Factor models of variance in finance The BurStFin R package The quality of variance matrix estimation The problem Someone asked me some questions about the statistical factor model in … Continue reading →

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An election puzzle

November 12, 2012
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John Jackson and Jack Johnson were going head to head in a mayoral race. Ultimately John Jackson obtained 300 votes and Jack Johnson obtained 200 votes. While counting the votes they announced after each vote what the current results were. For example...

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Beware of Excel Histograms

November 12, 2012
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Beware of Excel Histograms

Excel histograms are a disgrace. Microsoft should be embarrassed to have them associated with their ubiquitous and generally wonderful spreadsheet, Excel. I have previously posted on how useful and versatile Excel is for enabling people to bypass the number crunching, … Continue reading →

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An election puzzle

November 12, 2012
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John Jackson and Jack Johnson were going head to head in a mayoral race. Ultimately John Jackson obtained 300 votes and Jack Johnson obtained 200 votes. While counting the votes they announced after each vote what the current results were. For example...

Read more »

Video: Bayesian estimation supersedes the t test

November 11, 2012
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Bayesian estimation supersedes the t test in 15 minutes of video.  For the complete info, see the article and software at this site.

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Building the Perfect Beach Search Engine

November 11, 2012
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Building the Perfect Beach Search Engine

Currently, as I've mentioned in previous posts, beaches are a strangely under-served segment of the local search space. Searches on Google and Bing for beaches are fielded by entities such as resorts and restaurants that happen to be matches for...

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Sunday Data/Statistics Link Roundup (11/11/12)

November 11, 2012
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Statisticians have been deconstructed! I feel vaguely insulted, although I have to admit I’m not even sure I know what the article says. This line is a doozy though: “Statistics always pulls back from the claims it makes…” As ...

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Sunday Data/Statistics Link Roundup (11/11/12)

November 11, 2012
By

Statisticians have been deconstructed! I feel vaguely insulted, although I have to admit I’m not even sure I know what the article says. This line is a doozy though: “Statistics always pulls back from the claims it makes…” As a...

Read more »

Sunday Data/Statistics Link Roundup (11/11/12)

November 11, 2012
By

Statisticians have been deconstructed! I feel vaguely insulted, although I have to admit I’m not even sure I know what the article says. This line is a doozy though: “Statistics always pulls back from the claims it makes…” As a...

Read more »

Sunday Data/Statistics Link Roundup (11/11/12)

November 11, 2012
By

Statisticians have been deconstructed! I feel vaguely insulted, although I have to admit I’m not even sure I know what the article says. This line is a doozy though: “Statistics always pulls back from the claims it makes…” As a...

Read more »


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