Statistics you can read and run.

Why this site exists

Search for almost any statistics term and you land in one of two places. Either a wall of notation that assumes you already know the answer, or a bare calculator that hands you a number with no explanation of what it means or whether you should trust it. Neither helps much when you are stuck on a real problem at eleven at night.

Statohub is built on the assumption that those two things belong together. A guide here explains the method in ordinary language, works a realistic example through by hand so you can follow the arithmetic, and then — where a calculator makes sense — gives you the same computation as a tool you can run on your own data. The explanation and the tool live at the same URL because that is how people actually use them.

We also try to be honest about limits. Most statistics writing tells you how to compute something. The harder and more useful question is when the method misleads you, and what to reach for instead. Our guides are expected to answer that too.

Who writes Statohub

Everything here is published under the byline of the Statohub Editorial Team — the small group responsible for commissioning, writing, checking and maintaining this site. We use a team byline rather than individual author names because no guide here is the work of one person start to finish: topics are researched and drafted, then independently reviewed against a written checklist, then cross-checked against the calculator that implements the same maths. The team, not any single contributor, is accountable for what ships.

Some guides in our applied section are commissioned from outside subject-matter writers. Those drafts are not published as they arrive. They are edited for house style, stripped of promotional links, checked for accuracy and overlap with our existing coverage, and only then published under the same team byline and the same standard as everything else.

How a guide gets made

Every article moves through the same four stages before it goes live.

1. Brief. We decide what question the page has to answer and which related questions belong on it. One topic gets one page. If a subject is already covered elsewhere on the site, the new draft links to it rather than restating it — this keeps pages from competing with each other and keeps each one genuinely about its own subject.
2. Draft. The guide is written to the brief, with at least one example worked all the way through in real units, plus the failure modes and edge cases that a reader will actually hit.
3. Review. A separate review pass grades the draft against a fixed editorial checklist: is the arithmetic right, is the structure sound, are the internal links valid, are there any invented statistics or fabricated citations. Drafts that fail come back with a specific fix list rather than being waved through.
4. Publish and revisit. Guides carry a visible last updated date. We revise pages when we find an error, when an explanation is not landing, or when we can replace a generic example with a better one.

How the calculators are built

The calculators are not embedded third-party widgets. Each one is a small, self-contained function written and maintained in this codebase, and every one of them is covered by an automated test suite that runs before the site can be deployed. Those tests check the results against values worked out independently, including the awkward cases — empty inputs, single values, ties, negative numbers, sample versus population formulas — that are the usual source of quietly wrong answers.

They also run entirely in your browser. Numbers you type into a calculator here are computed on your own device; they are not sent to us, stored, or logged as calculator submissions. There are no accounts to create and nothing to sign in to. The full detail is in our privacy and cookie policy.

What we will not publish

A few things are ruled out on purpose, and it is worth saying so plainly.

• No gambling or betting-odds calculators. The maths overlaps with probability, and the traffic would be good. We do not publish them, because a tool that helps someone bet is not statistics education and we are not willing to build that audience.
• No invented evidence. We do not cite studies we have not read or quote statistics we cannot source. Where a guide uses numbers to demonstrate a method, they are presented as a worked scenario, never dressed up as a real-world finding.
• No advice that needs a professional. Statohub teaches methods. It is not medical, legal, or financial advice, and it is not a substitute for a statistician who can see your actual data.

What is covered

The site is organised into two sections. Learn covers the concepts and methods themselves, from the vocabulary up. Applied covers using them on real problems — experiment design, model diagnostics, forecasting and the rest. Both are grouped into ten subject hubs:

• Foundations
• Descriptive statistics
• Probability distributions
• Inferential statistics
• Regression and correlation
• Combinatorics
• Data analysis
• Experiments and causality
• Time series and forecasting
• Machine learning statistics

Every calculator on the site is also listed together in the calculator directory if you would rather start from the tool than the explanation.

Corrections

If you find a mistake — a wrong number, a broken formula, an explanation that is misleading — please tell us. Corrections to the maths are treated as urgent and we would much rather hear about them from you than leave them up. Write to admin@statohub.com with the page address and what looks wrong. When we correct something substantive, the page's updated date changes with it.