Monthly Archives: October 2014

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Breaking timeseries data into sessions

October 26, 2014/0/0/

Edit: Since writing this I've found lots of ways to simplify this solution, for instance making use of the lag function in MS SQL, or MySQL solutions using variables, but I'll leave this here anyway! Problem: You have a lot of data about users interacting with your site, with a UserID and timestamp for each transaction. [...]


Data Science Map

October 23, 2014/0/0/

A nice data science map by Swami Chandrasekaran.


Optimising with Simulated Annealing

October 9, 2014/0/0/

Tasked with optimising a complicated system, I went down the route of heuristic optimisation and ended up creating a simulated annealing algorithm in R. I don't want to go into too much detail about how the model works, because that has been done well enough elsewhere, but essentially it is a smart way of searching through all [...]