EJ
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- EJ
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Comments
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How many observations do you have in each of the cells? The feedback you are getting suggests this is the problem... E.J.
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Hi Pete, I think it works out, intuitively, if we respect the difference between BF as "evidence coming from the data" and posterior probabilities as "reasonable beliefs after seeing the data". Suppose you have many comparisons o…
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Hi PM, We haven't yet implemented Bayesian simple main effects. Yes I would do a t-test. The Bayesian post-hoc correction generally takes place through an adjustment of the prior model probability (so the BFs are the same for a pre-planned and a pos…
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Hmm I am a little confused -- in the Descriptives table, Age gets a 0 or a 1...can you screenshot a few rows of the data spreadsheet? Cheers, E.J.
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Hi Ken, Hmmm. I'll attend our EFA expert to this. Seems important, but I'm relatively sure there is a simple explanation. To get to the bottom of this, we might need a data file for which this happens. It is probably best to post the issue on our Gi…
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Hi MF, Below are some answers to your questions: "I am doing a 2 x 2 repeated measures, where I have measurements from 2 groups at 2 time points. I am most interested in the effect of group and a potential interaction. As a result, I have added…
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Well, the evidence is the evidence. So if BF = 3 in condition X, and BF = 4 in condition Y, then the evidence is larger for Y than for X. So what you really want to know, it seems, it whether effect size is larger in one condition than in the other,…
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Hi Pete, Hmm yes this is very interesting. This is also an understudied topic. Based purely on pragmatic considerations, I'd recommend option 2: it is based on a published paper, it is close to option 3, and it is used in JASP. You could argue for o…
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I'll forward your question to Don! E.J.
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I've asked our ANOVA expert to take a look at this as well
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Hi m.p., I would think it is identical to what lavaan expects (since the SEM module is basically a GUI for lavaan). I'll bring this to the attention of our SEM expert though. E.J.
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Hi Gaffiere, This happens because RM ANOVA is based on a numerical procedure. You can up the accuracy by increasing the samples under "Additional Options" -> "Numerical Accuracy". If you find it annoying to get slightly differ…
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Hi kszechy, Thanks for your question. Let me forward this to our SEM expert... Cheers, E.J.
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Hi Gary, In the output, if you click to expand the triangle next to "Mediation Analysis", you see the option "copy citations". See screenshot below. I've just done this and paste the relevant output here: Rosseel, Y. (2012). lava…
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Yes, I believe this is appropriate. E.J.
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Hi Kevin, I have not looked into this -- in general, it would be worthwhile to develop Bayesian equivalents for all those variants of frequentist ANOVA...but we are not quite there yet. Cheers, E.J.
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Dear Eliza, As far as ROPE is concerned: I have some issues with that analysis, in the sense that it depends crucially on the bounds of an interval and that it does not quantify evidence. So I personally do not believe it answers a relevant question…
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Hi Philip, JASP implements the JZS approach from Rouder et al., 2012, as implemented in the BayesFactor package. This is a more subtle approach than the BIC, although they are trying to estimate the same quantity. Cheers, E.J.
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I'll pass this question along... E.J.
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Hi Henryk, I am not 100% on what you want to accomplish. When you use the Cauchy prior, you simply stipulate it; nothing is calculated from data. Perhaps you want to use existing data to construct a prior? In that case, keep in mind that when you st…
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Hi Henryk, This is actually a difficult question. I'd be inclined to say "no", as the hypotheses are computed on different data. It seems to me that you need the BF for the interaction between congruency and red/green trials. So I'd model …
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Hi Carlo, The simplest way to combine the items is to compute a sum score. You can either do this in Excel (or Calc for instance) or, in JASP, you can use our "compute column" functionality. The JASP website offers help: go to https://jasp…
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Hi Emilie, Re. 1) You can see from the table that the summed posterior probability for the models that include the factor of interest is "1.000". In reality, that is not exactly true -- there must remain some sliver of posterior probabilit…
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Hi Pete, First and foremost, here is a thesis that summarizes some of this work: https://psyarxiv.com/s56mk Second, I was a little confused about how many conditions you have -- you say "This means I will do 12 comparisons, 6 for the young part…
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Hi kev_bague, JASP does not (yet) offer sequential analyses for ANOVA; the reason is that there are several BFs in play, and only one may be of interest. I guess we could show them all or ask the user to define the one that's of interest. Also, the …
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Thanks for your question. This is a pretty general one, but I can point you to: 1. A post at https://jasp-stats.org/2018/03/20/perform-network-analysis-jasp/ 2. A video at https://www.youtube.com/watch?v=KacSF0TzoPg&feature=youtu.be I am not sur…
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I'll ask around :-)
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Hi TJU, The next version of JASP includes a JAGS module. For most other Bayesian analyses, we use analytic expressions (whenever we can), BAS, or BayesFactor (two R packages). These use their own sampling methods, but that's often (not always) not M…
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Dear JDeBeer, Thanks Probably means that there are some text entries in some of the cells (e.g., "banana") and that makes it impossible, for instance, to compute a mean. Not sure -- probably the design is such that the model is not identif…
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It means that the data are not sufficiently diagnostic for the purpose of discriminating the models -- all models retain a non-negligible amount of posterior probability. E.J.