Blog Archives

The Average Hotel Does Not Get The Average Rating

October 1, 2011
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The Average Hotel Does Not Get The Average Rating

The millions of travelers who review hotels, restaurants, and other attractions on TripAdvisor also supply a numeric rating by clicking one of five circles ranging from 1 for "terrible" to 5 for "excellent." On the whole, travelers are pretty kind.The ...

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Common Table Expressions

August 23, 2011
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Common Table Expressions

It's been a while since I posted. My new role at TripAdvisor has been keeping me pretty busy! My first post after a long absence is about a feature of SQL that I have recently fallen in love with. Usually, I leave it to Gordon to write about SQL since ...

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JMP Webcast:: Measuring What Matters

May 22, 2011
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On Tuesday, May 24 at 1:00pm Eastern Daylight Time, I will be presenting a webcast on behalf of JMP, a visual data exploration and mining tool.  The main theme of  the talk is that companies tend to manage to metrics, so it is very important ...

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Michael Berry announces a new position

May 17, 2011
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Hello Readers,As some of you will already have heard, I have accepted the position of Business Intelligence Director at TripAdvisor for Business--the part of TripAdvsor that sells products and services to businesses rather than consumers. The largest p...

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Data Mining Techniques 3rd Edition

April 1, 2011
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Data Mining Techniques 3rd Edition

Gordon and I spent much of the last year writing the third edition of Data Mining Techniques and now, at last, I am holding the finished product in my hand. In the 14 years since the first edition came out, our knowledge has increased by a factor of at...

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How to calculate R-squared for a decision tree model

March 22, 2011
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A client recently wrote to us saying that she liked decision tree models, but for a model to be used at her bank, the risk compliance group required an R-squared value for the model and her decision tree software doesn't supply one. How should she fill...

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Upcoming talks and classes

March 11, 2011
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Michael will be doing a fair amount of teaching and presenting over the next several weeks:March 16-18 Data Mining Techniques Theory and Practice at SAS Institute in Chicago.March 29 Applying Survival Analysis to Forecasting Subscriber Levels at the Ne...

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Cluster Silhouettes

March 4, 2011
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Cluster Silhouettes

The book is done! All 822 pages of the third edition of Data Mining Techniques for Marketing, Sales, and Customer Relationship Management will be hitting bookstore shelves later this month or you can order it now. To celebrate, I am returning to the bl...

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Interview with Michael Berry

October 5, 2010
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We haven't been updating the blog much recently.  Data mining blogger, Ajay Ohri figured out why.  We have been busy working on a new edition of Data Mining Techniques. He asked me about that in this interview for his blog.

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Why is the area under the survival curve equal to the average tenure?

June 21, 2010
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Why is the area under the survival curve equal to the average tenure?

Last week, a student in our Applying Survival Analysis to Business Time-to-Event Problems class asked this question. He made clear that he wasn't looking for a mathematical derivation, just an intuitive understanding. Even though I make use of this pro...

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