Running Multiple A/B Tests at Once: When Overlap Is Safe
Every experimentation program hits this question within its first few months: test A is running on the homepage, the checkout team wants to launch t…
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You Don't Need a Math PhD for Data Science — You Need to Stop Skipping the Boring Step
Ask someone switching into data science what worries them and it's almost always the same thing: do I know enough math? So they spend weeks on gradi…
Your eval monitor fired on four days this week. At your sample size, that was the most likely count
A team I compared notes with recently runs continuous evals on production traffic: an LLM judge scores a sample of traces, the scores land on a dash…
Conformal prediction silently breaks under drift - and how to make it hold
Conformal prediction is the easiest way to put a calibrated uncertainty band around any model: wrap a point predictor, and you get intervals with a…
I Built CausalLens — A Free, Open-Source Causal Impact Calculator for Time Series (5 Methods, Zero Setup)
I want to show you a tool I just open-sourced. It's called CausalLens, and it answers one specific question that most analytics stacks get completel…
Cointegration and Pairs Trading: When Time Series Move Together
Pairs trading rests on a simple idea: find two assets that move together, wait for them to diverge, and bet on convergence. The hard part is definin…