Sample size planning when your weekly actives wobble
Festival weeks, payday spikes, and why a flat MDE calculator will embarrass you in October.
Journal
Notes we still argue about on Thursday.
These essays come from studio critiques and the alumni reading circle. They are not recaps of the syllabus.
When App Store listings skew the test you thought you ran in-app
Screenshot experiments leak into activation. Here is how we separate the surfaces.
Reading guardrail metrics on Android without drowning in ANR noise
Which stability numbers may veto a ship, and which ones are just Play Console weather.
How three Thailand teams ship a weekly mobile test without a data science bench
Release-train habits from Chiang Mai, Phuket, and Bangkhunprom alumni.
Holdout groups that do not quietly hurt retention
How to keep a long-running holdout honest when marketing wants everyone in the new onboarding.