Month: November 2023

Writing to clear your mind

Posted on by Darren

I’m kind of a sucker for self-help life-hacks. Many are worthless, but one that I find helpful is “journaling”. Of course keeping a journal is not novel, but I starting taking it more seriously after learning about Meditations by the Roman emperor Marcus Aurelius. I recommend the blog and podcast by Ryan Holiday called the…

Interaction effects require massive increase in sample size

Posted on by Darren

I gave a quick internet-read to this blogpost by Andrew Gelman. The core of the idea is that to estimate an interaction effect a huge increase in sample size is needed compared to estimating a main effect. That is, if you power a study on main effects you could be very underpowered if you want…