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I am trying to develop a short equity strategy that dedicates some, currently arbitrary, percentage of short capital to potential frauds.

I am aware of Benford's Law, but this is not my specialty.

What quantitative methods are available to potentially detect fraud?

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Not an answer to the question, but you may be interested in extremely accurate models in the literature of default probability. But more onto your question, this is a supervised learning problem. You need data on frauds and non frauds, and all features you can possibly get your hands on, then train your model and test it using cross-validation or something of the sort. Quite a straightforward problem actually. The difficulty is getting relevant features together. This could come in the form of secondary market process characteristics, accounting variables, dummy variables (industry), etc. –  user2763361 Dec 29 '13 at 10:46
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To add to the above, most likely you want a nonlinear model such as random forests since it will be interactions between these variables that are likely to indicate fraud. –  user2763361 Dec 29 '13 at 10:49
    
@user2763361 Thank you! I've already started down the default non-default road, but thank you very much for "random forests". That's new on me. –  quantycuenta Dec 30 '13 at 22:33
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