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Anomalies
Outliers, aberrations, fat tails, trouble at the mill and maybe something good once in awhile
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A Long Tail of Whales: Half of Mobile Games Money Comes From 0.15 % of Players

A Long Tail of Whales: Half of Mobile Games Money Comes From 0.15 % of Players | Anomalies | Scoop.it

"One player spent about $10,000 per month on in-app purchases. The company... assigned an employee to cater just to that whale, to ensure that she was always satisfied with the game."

Ellie Kesselman Wells's insight:

This sort of extreme revenue concentration indicates that mobile gaming remains speculative, as a business AND as an investment.

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Anomaly Tracker

For years, our researchers have analyzed and crunched numbers looking for outliers -- instances where a politician relies to an unusual degree on one group of donors, for instance,...

Ellie Kesselman Wells's insight:

This is a helpful tool for identifying possible anomalies, then ruling out any false positives. The means to do both are provided by the same web app. There's also a thorough caveat about proper data and contextual checks, before drawing conclusions from initial results. While I was in the process of checking why, for example, a particular Republican from MN had the most anomalies, I found that the dollar amounts, and scope of legislation, was much less than that of others, both Republican and Democrat, for the same state. The Anomaly Tracker provided the means to check all of it. They did a good job!

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A tutorial on outlier detection techniques using R

RDataMining. There is an excellent tutorial on outlier detection techniques, presented by Kriegel et al. at ACM SIGKDD 2010. It presents many popular outlier detection algorithms ...

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Not Your Normal Data: The Impact of the Outlier

Outliers deviate from the norm. But outliers can tell us more about our data, how we gather it, and what is in it, if we examine the data set carefully.
Ellie Kesselman Wells's insight:

At least 5% of data contains anomalies. Some are errors, many are valid. Try using the IQR, inter-quartile range, to determine whether outlier data is valid. Deleting outliers is another way,  but there are better methods.

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In Search Of An Absolute Strategy

In Search Of An Absolute Strategy | Anomalies | Scoop.it
Most hedge funds claim to produce positive absolute returns. The reality is sobering: most strategies still largely depend on stock market performance and those not incorporating equities haven't kept their promises either.
Ellie Kesselman Wells's insight:

Natural motivation for a brief discussion of skew and kurtosis

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