Hypothesis testing - Jamovi's naming convention

Discuss the jamovi platform, possible improvements, etc.

by wasia » Tue Dec 29, 2020 6:01 pm

Hi!
Jamovi is a great piece of software. I just started to use it and I have one simple (I think) question.
Performing for example paired samples t-test we can select "Hypothesis" (see attached image) and here's my problem.
What kind of hypothesis it is? Null or alternative? I think it is the alternative hypothesis but wanted to ask to be sure.
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by jonathon » Mon Jan 04, 2021 10:45 pm

hi yes, it's the alternative hypothesis.

kind regards

jonathon
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by wasia » Tue Jan 05, 2021 9:22 pm

OK, thanks for the confirmation. This may look like a small thing but it is important.
Thank you.
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by reason180 » Thu Feb 18, 2021 4:07 pm

However, in fact, the t test is necessarily a test of the null hypothesis (the alternative hypothesis plays no role unless one is computing a Bayes factor). Correct?
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by wasia » Thu Feb 18, 2021 4:34 pm

Well, as far as I understand the concept of hypothesis testing if you test for null hypothesis you test also for alternative one. Hope you understand what I'm trying to say.
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by reason180 » Thu Feb 18, 2021 7:48 pm

A classical t test is a null-hypothesis test. For a given sample size, the p value is the probability that you would obtain an effect-size at least as large as the one you obtained, if the null hypothesis were true.

If you try to take the result and draw an inference relating to the alternative hypothesis, you're on very thin ice, conceptually. That's why people are turning to Bayesian analysis instead.
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by reason180 » Thu Feb 18, 2021 11:33 pm

Perhaps, technically, it should be:

Measure 1 = Measure 2
Measure 1 not < Measure 2
Measure 1 not > Measure 2
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