10 min read
North star metric: what it is, 10 examples and a worked case
What is a north star metric? North star metric examples for 10 product types, a test that exposes weak ones and a worked case on six months of data.
Blog
RSS feedPractical articles on statistics, A/B testing and data-driven decisions for product managers and marketers.
7 min read
Financial runway: your personal runway before you quit your job to build a product
Calculate your financial runway before you quit your job to start a business: savings, a cash reserve, side income and net burn, with three scenarios.
8 min read
Pre-selling: how to pre-sell a product before you build it
Pre-selling before you write code: a one-page presell offer, a decision rule set in advance, how to ask for money and what the answers mean.
6 min read
Ramen profitability: the first number a self-funded founder should aim for
Ramen profitability is when revenue covers the founders’ basic living costs. How to calculate it with taxes, fees and churn, on a worked example.
9 min read
Tracking plan template: what a tracking plan is, a filled-in example and a QA checklist
What a tracking plan is, and a free tracking plan template in six sections: questions, events, properties, metric definitions, QA, change log, with an example.
8 min read
Viral coefficient (k-factor): the formula, a worked example and why k below 1 still matters
The viral coefficient (k-factor) is how many new users each user brings. The formula, a worked example, what k below 1 adds and how to measure it honestly.
9 min read
What is product analytics? The questions it answers, the tools and how to start
What is product analytics? Measuring what people do in your product and turning it into decisions: the eight questions it answers, the tools, a worked example.
9 min read
Confidence interval in A/B tests: what it really tells you
What a 95% confidence interval tells you in an A/B test, how to read one that crosses zero, and why it beats a bare p-value for ship decisions.
9 min read
Now Next Later roadmap: how the format works, with an example and answers to "but when?"
How a Now Next Later roadmap works: what each column means, why confidence falls with distance, the disclaimer and how to answer "but when?".
9 min read
Outcome-based roadmap: what it is and how to build one, with a one-page example
What an outcome-based roadmap is, how it differs from a feature roadmap, its five components and a one-page example you can adapt.
9 min read
RICE framework: the RICE prioritization formula, a worked example and the mistakes that break it
The RICE framework explained: RICE scoring as Reach × Impact × Confidence ÷ Effort, what each scale means, a worked example with six ideas and common traps.
10 min read
How to calculate sample size for an A/B test: formula, example and calculator
How to calculate sample size for an A/B test: the formula, a worked example, how statistical power and MDE change the number, and a free calculator.