Statistics: Terms and Tests

What is in this deck

With this deck you learn what statistical results actually mean: description, probability, inference, the tests and the traps that publish most often.

A p-value is not the probability that the null hypothesis is true. A confidence interval is a statement about the procedure, not about this particular interval. Those two sentences are the most common errors in published work, and they are on the first cards of this deck.

90 cards: description before inference, probability before testing, and design before all of it, because no analysis rescues a sample that was chosen badly. Then the tests and what each one assumes, effect size beside significance, and the diagnostics that reveal a model that fitted the noise.

The medical statistics are here too, because they are where the errors cost most: sensitivity against predictive value, relative against absolute risk, and number needed to treat.

The categories decide what comes up: start with “Descriptive” alone and add the rest when you are ready.

What you learn

• Mean, median, spread and when each one lies
• What a p-value is, and the two things it is not
• Type I and Type II error, power and effect size
• Which test for which question, and its assumptions
• Base rates, predictive value and absolute risk

The categories

10 categories sort the 90 cards. You can filter by category and take on what is due right now.

1. Descriptive
2. Design
3. Distributions
4. Ethics
5. Foundations
6. Inference
7. Modelling
8. Probability
9. Relationships
10. Tests

Learning with Qardbox

You see a card, you think, you turn it over and say whether you knew it. A round asks nothing more of you, and how the app works out the next date from that is on the page about FSRS-6.

What sits comes back less often, what wobbles comes back soon. You set a daily goal, and when nothing is due the app tells you exactly that instead of inventing work for you. How a round goes is shown on the learning page.

Everything stays on your device. No account, no sign-up, no ads. After the purchase the deck sits in your library like any other subject and can be studied, reordered and extended just like your own.

What it costs, and what it doesn’t

Qardbox itself costs nothing, and it stays that way. Every function is there from the start, with no subscription, no ads and no tiers; what that rests on is on the page about what it costs.

Your own cards stay unlimited, and decks from friends or from the family you read in without a limit, from a file as well. You do not need this deck in order to learn with Qardbox.

It is a shortcut: 90 checked cards for €0.99, once, with Family Sharing. The work you would otherwise do is already done. The App Store shows the price in your currency.