Category: programming

rsq-mc-5 0

When not to use R squared

Ever wondered how relevant the R^2 value of any data series actually is? Sometimes, you see reasonably good coefficients of determination (depending on your scientific discipline and research question, "reasonably good" means something between...


Phusion Passenger and Django Deadlock

If you have the following symptom: You use Django and Phusion Passenger in at least version 4. A specific request is waiting forever. Restarting apache has no effect. Then you can check for the...


Medieval Swords and Graph Theory

A few days ago, I came across a challenge put up by the British Library (here, German and here, English). They have a sword (not too far from UCL where I work) with an...