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Pro tip: never define what is p-value on the fly

It's not so hard: the p-value is that thing you want to interpret as alpha.

Ответ для Will Lowe

"A p-value is the thing that determines if you get published."

Ответ для Will Lowe

Relatedly, I can also define alpha in one sentence. But that would be showing off.

“The probability of the data given the null hypothesis.”

Ответ для Lee Phillips

Nope, because for a traditional frequentist the data can't have a probability

Ответ для Cory Shain

Be careful what you wish for or we’ll get stream of consciousness stats papers

Julia single-handedly keeping academic Bluesky alive

Ответ для Jin X. Goh | 吴晋勋

Alive or undead?

I don’t get it—aren’t you German? Of course it can be done in one sentence—it’s just a long and complex one. Try reading László Krasznahorkai; he could handle a p-value, compare it to Bayes, and still have 100 words left to work with.

Ответ для Chris Crandall

In the German language it can be done in a single world, Nullhypothesenabweichungsextremitätskoeffizient.

At the risk of initiating discourse, is there something wrong with "a p-value is the probability of observing your data under the null"?

Ответ для Mike Murphy

For the audiences in mind eg beginner students or New Yorker readers, this means more sentences explaining 'the null', and possibly 'data'.

Ответ для Mike Murphy

Sorry, but is this bait? (Yes, it's an incorrect definition ... would need at least an "or something more extreme" to be correct, unless I'm missing something ...)

Ответ для Mike Murphy

In brief: "probability of observing your data" isn't a well-defined statement. For example: the probability of flipping exactly 500 heads out of 1000 from a fair coin is ~2%, but that would not be a useful p-value. Likewise, the probability of observing any specific values from a Normal dist is 0

Ответ для Mike Murphy

I think my biggest issue with definitions like these is the it neglects that it is an estimation. Part of the mass confusion around stats, from my pov, is that people treat stats as ground truth and not models. You don't do stats on a ground truth, you don't make estimates on ground truths.

Except that the definition is easy.

Standard deviation?

Ответ для Jeremy Freese

A standard deviation is the second most widespread statistical concept that is not definable in a single sentence.

I think this author did it pretty well within this article theconversation.com/what-is-a-p-...

What is a p-value? An expert explains the most misunderstood number in scienceBoiling scientific truth down to a single number has had bad consequences for our understanding of the world.theconversation.com

Can I ask a q of you & @statsepi.bsky.social? I understand the explanation of p-values, and also the frustration with the oversimplifications. But saying "it approximates the probability that the results are due to chance" gives an idea of what it is. I find that useful. Is that really bad?

Ответ для Tamar Haspel

I’m afraid this flips the statistical conditional — “given these data, how likely just chance?” — when the logic is closer to “given just chance, how likely these data?” Now how bad that is probably depends on the context and the extent to which it’s taken seriously in the first place 😅

It's much easier if you are a nihilist in an intellectual community of other nihilists because then you can just say "it's the probability of the data" and be done

A p-value is the thing you check to decide if you can send your paper to a high IF journal. Was not too hard