● Free — every case · No subscription · 125+ cited sources

You learned biostats once. Then you forgot it. Then you needed it.

Biostatistics prep
that actually sticks.

50+ case-based challenges. 1,000+ board-style questions. A spaced-repetition scheduler (FSRS-6) that catches you right when you're about to forget.

Built for residents preparing for boards, MPH students mastering core methods, and early-career researchers shoring up methodology before their next manuscript.

AI tutor that refuses to just hand you the answer · 3-layer hint ladder · Printable Statement of Competency
Start free diagnostic → See how it works

10 questions · ~5 minutes · no signup · nothing to buy

Selçuk Korkmaz
Written & maintained by

Selçuk Korkmaz, PhD

Biostatistics researcher & methods educator

Every question, deep dive, and citation is personally authored and method-categorized — not paraphrased from another QBank.

Website Google Scholar GitHub

Every answer is graded, timed, and scheduled. The FSRS-6 engine picks exactly when you see each concept again.

Try a real question
1,000+
Board-style questions
50+
Case-based challenges
125+
Cited sources
How it works

Built for how people actually learn

Active recall, spaced repetition, and context-rich cases — not another passive video course.

Real clinical cases, not drills

Each case sets a scenario — critique a manuscript, advise a resident, design an RCT. Questions live in context, so the methods feel like tools, not trivia.

A scheduler that catches forgetting

After every answer, grade yourself Again / Hard / Good / Easy. The FSRS-6 scheduler — a research-tuned successor to SM-2 — picks exactly when each card comes back, so you review the things you're about to forget, not the things you already know.

Deep dives, not just answers

Every question links to intuition, formula, assumptions, pitfalls, and primary-literature reading. Learn the why, not the memo — and defend it in journal club next week.

XP, streaks, mastery

Review-day streaks, perfect-run badges, and a per-method mastery panel that shows how confidently the scheduler thinks you know each topic. Gentle gamification — it rewards consistency, not grinding.

The curriculum

Eight domains, fundamentals to advanced

Foundations Probability & Sampling Estimation & Inference Regression Study Design & Bias Missing Data & Measurement Causal Inference Advanced & Bayesian
Built for you

Who it's for — and why now

Three audiences, one common problem: the biostats you need to pass, publish, or teach isn't the biostats most courses actually cover.

Residents & med students

Boards, USMLE, journal club, your first paper. Learn the actual methods examiners test — not a vague tour of "what statistics is."

Typical use: 15 min/day, 6 weeks out from an exam.

MPH & doctoral students

Qualifying exams, methods coursework, thesis defenses. Work through survival, mixed models, causal inference with cited sources and worked logic.

Typical use: methods prep alongside a course or defense.

Early-career researchers

Shore up methodology before your next manuscript, grant, or peer review. Understand when a mixed model helps and when a GLM is enough.

Typical use: targeted review of domains that rarely came up in grad school.
How this is different

Not another textbook, video course, or QBank

Each of those teaches part of the job. BioStat Quest stitches them together — context, practice, retention, and reasoning — into a single loop.

Textbooks
Clinical scenario
Occasional
Active recall
No
Spaced repetition
No
Cited sources
Yes
Cost
$80–200
Video courses
Clinical scenario
Sometimes
Active recall
Passive
Spaced repetition
No
Cited sources
Rare
Cost
$20–80/mo
BioStat Quest
Clinical scenario
Every case
Active recall
Every question
Spaced repetition
FSRS-6 engine
Cited sources
125+ linked
Cost
Free
What you get

All of it. Free.

There is no paid tier, no trial timer, and no card on file. Sign in to keep your progress across devices — that's the only reason to make an account.

  • Full catalog — all 50+ cases, 1,000+ questions, day-one access to new content
  • FSRS-6 scheduler — spaced repetition that resurfaces a method right before you forget it
  • AI tutor — scoped to one question at a time, refuses off-topic
  • Full hint ladder — layers 1–3, from orienting nudge to partial walk-through
  • Unlimited exam mode + branch-level breakdown report
  • Statement of Competency — print-ready dated record per method
  • Full misconception ledger — per-tag drill-down, long-tail trends
  • 125+ cited sources — every method deep-dive links back to the primary literature
Start the diagnostic →
Frequently asked

Before you start

What does it cost?

Nothing. Every case, the FSRS-6 scheduler, the full hint ladder, the AI tutor, unlimited exam mode, the Statement of Competency and the full misconception ledger are open to every account. There is no paid tier and no card on file — an account exists only so your progress follows you between devices.

Who writes and reviews the content?

Every question, deep dive, and citation is personally authored by Selçuk Korkmaz, PhD — a biostatistics researcher and author of several R packages on CRAN. Content is method-categorized and sourced from primary literature, not paraphrased from another QBank.

Do I have to sign up to try it?

No. The diagnostic and every case work in guest mode — progress is saved locally. Sign in only when you want to sync across devices or join the leaderboard.

Does it work on my phone?

Yes. Everything runs in the browser on iOS, Android, and desktop. Nothing to install. The R Lab runs R in the browser via WebR — even that works on a phone, though a laptop is nicer for code.

How much time does it take?

A case is ~15 minutes. A daily review session is 3–8 minutes once the scheduler picks up. Most users find 15 min/day over 4–6 weeks is enough to feel fluent before an exam or journal club.

● For educators & institutions

Use BioStat Quest in your course.

Assign cases as structured homework, route students to method deep-dives when they stumble, and get a class-level view of where the cohort is strong — and where it's not. Free for your whole class: create a class, share the join code, and every student has full access.

Learn more → Email us
Structured homework
Assign cases or whole branches. Track class-level completion and accuracy.
Instructor dashboard
Per-branch accuracy, flagged weak areas, per-student status at a glance.
Syllabus-aligned collections
Curated bundles for MPH, residency, board prep. No seat limit — the whole cohort, free.

Ready when you are.

Try the diagnostic — ten questions, ~five minutes, no signup. Then work the full case library with the FSRS scheduler and every method deep-dive, free.

Start free diagnostic → Sign in

Everything is included — the full catalog, the AI tutor, the complete hint ladder, unlimited exam mode and the Statement of Competency. No credit card, ever.