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I am looking for a simple suggestion algorithm to implement in to my Web App. Much like Netflix, Amazon, etc… But simpler. I don’t need teams of Phd’s working to get a better suggestion metric.
So say I have:
I want to suggest to User1 they might also like Object2.
I can obviously come up with something naive. I’m looking for something vetted and easily implemented.
There are many simple and not so simple examples of suggestion algorithms in the excellent
Programming Collective Intelligence
The Pearson correlation coefficient (a little dry Wikipedia article) can give pretty good results. Here’s an implementation in Python and another in TSQL along with an interesting explanation of the algorithm.