Difference in differences

This is something we all need to understand, and to check whether studies use it or not. You can’t just compare differences in outcomes between two populations, you need to compare the difference in differences. This tends to reduce the size of the effect and...

Childish to the last

I love that our paddling next Sunday is taking place alongside A Kung Kok Street. So much to giggle about in Cantonese street names.

Economist: wireless harmless

Cracking Economist piece on science: The whole brouhaha over mobile phones causing brain cancer is a monumental irrelevance compared with scofflaws who insist on using their handsets to text or talk while driving. Regretfully, that is a far more likely cause of death...