EJ
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- EJ
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Comments
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First of all, you need a column that indicates the group assignment, for instance "group". If you have this column in your data set, it should show up under "Density plots"; you can then select it and drag it to "Separate de…
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Yes the data would be good, but screenshots of the relevant tables would be good too. Did you use a recent version of JASP? We updated the model specification a year ago, see for instance https://jasp-stats.org/2022/07/29/bayesian-repeated-measures-…
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hmm I don't think the blog post happened...but it would just have summarized the paper E.J.
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Awesome! EJ
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I don't think so. Perhaps it is also available somewhere else, I'll ask the team.
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In the Distributions module -> Normal -> assess fit.
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Yes.
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Well, I think there is moderate evidence in favor of including this predictor in the regression equation. The R2 value for the A-only model is not really relevant for this. And the beta coefficient is not only very small, it is negative as well; you…
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In the top table, the result from the bottom row means that the model with A alone fairs relatively poorly. However, what matters is the change from prior to posterior probability for all models that include vs exclude A, and this yields an inclusio…
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Frequencies -> multinomial
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In regression, you would just include B, C, and D as predictors (covariates). Another way to see this is to specify that D should be added to to the null model (under "model"). This way you can see what B and C contribute when D is already…
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Hi Matt, You are correct that these priors are not appropriate for BFs. We have not developed this. I recall a paper by Overstall & Forster on Bayes factors for GLMMs, where they employ a unit-information prior. That is an appealing idea. Cheers…
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I've contacted our expert! E.J.
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The equality of sample sizes is coincidental! The important aspect is that it is fixed by design and not random. EJ
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I think this is independent multinomial sampling. However, I would suggest that instead you use the Bayesian A/B test (also in JASP). Some relevant references with discussion: https://onlinelibrary.wiley.com/doi/10.1002/sim.9278 and https://psyarxiv…
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Yes: the icon indicates this to be a text variable. Maybe one of the fields is "NA" or something? EJ
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Dear Ryoko, The team remarks that "JAMF seems to be some proprietary package manager for Mac, so I have no effective way of debugging it." and "I'm not so sure what we can do about this. Our mac installer is nothing special". Sol…
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Dear Ryoko, I'll attend the team to this issue, but please note that this is more of an issue for our GitHub page than for this Forum, which deals with the stats interpretation side for JASP. Thanks for pointing this out -- we have not experienced t…
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There is only a single mathematically correct way to update, if the data are judged to be exchangeable. The second blog post referenced above discusses an example where one analyses a data set of 10 observations in two ways: (1) all data at once; (2…
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I do think the statement "posterior odds = BF times prior odds" is correct; it is just that the calculation of the BF requires some care, that is, you need to update not just your belief in the rival hypotheses but also in the competing pa…
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For continuous priors you have to specify different distributions. I think that in your case I would just select a normal distribution. You can get the best fitting normal distribution from the previous experiment from the mean and 95% central credi…
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The multiplication works only for point hypotheses, or when the data of the different experiments are independent (in the sense that knowledge about the one experiment does not affect your expectations about the outcome of the other experiment). Let…
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Hi Irina, I'm on vacation so cannot really delve into this, but it would be interesting to see how skewed your data really are, and why the log transform does not help. Regarding the priors: for the ANOVA, you cannot change the location of the para…
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I've forwarded this to our expert EJ
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I've forwarded this to our expert EJ
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I've forwarded this to our expert E.J.
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Thanks for posting, and apologies for the tardy response. I've forwarded this to our expert. Cheers, E.J.
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Look's like it's been fixed in 0.17.3: https://jasp-stats.org/release-notes/
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I'll check whether this has been fixed
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Sorry about the tardy response. I've asked our expert. In my opinion, it makes more sense to enter the frequentist results, because otherwise the prior is used multiple times (but I have not made up my mind about this) E.J.